81245840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78121}}^1$

素因数の和:78147

約数の個数: 40

約数和(自身を含む): 203429688

約数和(自身を除く): 122183848

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78121, 156242, 312484, 390605, 624968, 781210, 1015573, 1249936, 1562420, 2031146, 3124840, 4062292, 5077865, 6249680, 8124584, 10155730, 16249168, 20311460, 40622920, 81245840]

約数ペア:

[(1, 81245840), (2, 40622920), (4, 20311460), (5, 16249168), (8, 10155730), (10, 8124584), (13, 6249680), (16, 5077865), (20, 4062292), (26, 3124840), (40, 2031146), (52, 1562420), (65, 1249936), (80, 1015573), (104, 781210), (130, 624968), (208, 390605), (260, 312484), (520, 156242), (1040, 78121)]