21121555

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{761}}^1$

素因数の和:847

約数の個数: 32

約数和(自身を含む): 31747968

約数和(自身を除く): 10626413

約数列:

[1, 5, 7, 13, 35, 61, 65, 91, 305, 427, 455, 761, 793, 2135, 3805, 3965, 5327, 5551, 9893, 26635, 27755, 46421, 49465, 69251, 232105, 324947, 346255, 603473, 1624735, 3017365, 4224311, 21121555]

約数ペア:

[(1, 21121555), (5, 4224311), (7, 3017365), (13, 1624735), (35, 603473), (61, 346255), (65, 324947), (91, 232105), (305, 69251), (427, 49465), (455, 46421), (761, 27755), (793, 26635), (2135, 9893), (3805, 5551), (3965, 5327)]