19990355

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{379}}^1$

素因数の和:539

約数の個数: 32

約数和(自身を含む): 30205440

約数和(自身を除く): 10215085

約数列:

[1, 5, 7, 11, 35, 55, 77, 137, 379, 385, 685, 959, 1507, 1895, 2653, 4169, 4795, 7535, 10549, 13265, 20845, 29183, 51923, 52745, 145915, 259615, 363461, 571153, 1817305, 2855765, 3998071, 19990355]

約数ペア:

[(1, 19990355), (5, 3998071), (7, 2855765), (11, 1817305), (35, 571153), (55, 363461), (77, 259615), (137, 145915), (379, 52745), (385, 51923), (685, 29183), (959, 20845), (1507, 13265), (1895, 10549), (2653, 7535), (4169, 4795)]