81938480

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78787}}^1$

素因数の和:78813

約数の個数: 40

約数和(自身を含む): 205163952

約数和(自身を除く): 123225472

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78787, 157574, 315148, 393935, 630296, 787870, 1024231, 1260592, 1575740, 2048462, 3151480, 4096924, 5121155, 6302960, 8193848, 10242310, 16387696, 20484620, 40969240, 81938480]

約数ペア:

[(1, 81938480), (2, 40969240), (4, 20484620), (5, 16387696), (8, 10242310), (10, 8193848), (13, 6302960), (16, 5121155), (20, 4096924), (26, 3151480), (40, 2048462), (52, 1575740), (65, 1260592), (80, 1024231), (104, 787870), (130, 630296), (208, 393935), (260, 315148), (520, 157574), (1040, 78787)]