19679625

Appears in sequences

• Coreful abundant numbers (A308053) with an odd sum of coreful divisors.at n=4A339982
• Numbers k such that sigma(k) is either their sibling in Doudna tree (A005940), or one of the sibling's descendants.at n=12A347391
• Numbers k such that the odd parts of sigma(k) and A064989(k) are equal, where A064989 shifts the prime factorization one step towards lower primes, and sigma is the sum of divisors function.at n=18A374463