19815975

素因数分解:

$3^3\times 5^2\times {\mathrm{31}}^1\times {\mathrm{947}}^1$

素因数の和:997

約数の個数: 48

約数和(自身を含む): 37616640

約数和(自身を除く): 17800665

約数列:

[1, 3, 5, 9, 15, 25, 27, 31, 45, 75, 93, 135, 155, 225, 279, 465, 675, 775, 837, 947, 1395, 2325, 2841, 4185, 4735, 6975, 8523, 14205, 20925, 23675, 25569, 29357, 42615, 71025, 88071, 127845, 146785, 213075, 264213, 440355, 639225, 733925, 792639, 1321065, 2201775, 3963195, 6605325, 19815975]

約数ペア:

[(1, 19815975), (3, 6605325), (5, 3963195), (9, 2201775), (15, 1321065), (25, 792639), (27, 733925), (31, 639225), (45, 440355), (75, 264213), (93, 213075), (135, 146785), (155, 127845), (225, 88071), (279, 71025), (465, 42615), (675, 29357), (775, 25569), (837, 23675), (947, 20925), (1395, 14205), (2325, 8523), (2841, 6975), (4185, 4735)]