81264560

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78139}}^1$

素因数の和:78165

約数の個数: 40

約数和(自身を含む): 203476560

約数和(自身を除く): 122212000

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78139, 156278, 312556, 390695, 625112, 781390, 1015807, 1250224, 1562780, 2031614, 3125560, 4063228, 5079035, 6251120, 8126456, 10158070, 16252912, 20316140, 40632280, 81264560]

約数ペア:

[(1, 81264560), (2, 40632280), (4, 20316140), (5, 16252912), (8, 10158070), (10, 8126456), (13, 6251120), (16, 5079035), (20, 4063228), (26, 3125560), (40, 2031614), (52, 1562780), (65, 1250224), (80, 1015807), (104, 781390), (130, 625112), (208, 390695), (260, 312556), (520, 156278), (1040, 78139)]