21172840

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{2143}}^1$

素因数の和:2186

約数の個数: 64

約数和(自身を含む): 54028800

約数和(自身を除く): 32855960

約数列:

[1, 2, 4, 5, 8, 10, 13, 19, 20, 26, 38, 40, 52, 65, 76, 95, 104, 130, 152, 190, 247, 260, 380, 494, 520, 760, 988, 1235, 1976, 2143, 2470, 4286, 4940, 8572, 9880, 10715, 17144, 21430, 27859, 40717, 42860, 55718, 81434, 85720, 111436, 139295, 162868, 203585, 222872, 278590, 325736, 407170, 529321, 557180, 814340, 1058642, 1114360, 1628680, 2117284, 2646605, 4234568, 5293210, 10586420, 21172840]

約数ペア:

[(1, 21172840), (2, 10586420), (4, 5293210), (5, 4234568), (8, 2646605), (10, 2117284), (13, 1628680), (19, 1114360), (20, 1058642), (26, 814340), (38, 557180), (40, 529321), (52, 407170), (65, 325736), (76, 278590), (95, 222872), (104, 203585), (130, 162868), (152, 139295), (190, 111436), (247, 85720), (260, 81434), (380, 55718), (494, 42860), (520, 40717), (760, 27859), (988, 21430), (1235, 17144), (1976, 10715), (2143, 9880), (2470, 8572), (4286, 4940)]