81318640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78191}}^1$

素因数の和:78217

約数の個数: 40

約数和(自身を含む): 203611968

約数和(自身を除く): 122293328

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78191, 156382, 312764, 390955, 625528, 781910, 1016483, 1251056, 1563820, 2032966, 3127640, 4065932, 5082415, 6255280, 8131864, 10164830, 16263728, 20329660, 40659320, 81318640]

約数ペア:

[(1, 81318640), (2, 40659320), (4, 20329660), (5, 16263728), (8, 10164830), (10, 8131864), (13, 6255280), (16, 5082415), (20, 4065932), (26, 3127640), (40, 2032966), (52, 1563820), (65, 1251056), (80, 1016483), (104, 781910), (130, 625528), (208, 390955), (260, 312764), (520, 156382), (1040, 78191)]