81427840

素因数分解:

$2^7\times 5^1\times {\mathrm{13}}^1\times {\mathrm{9787}}^1$

素因数の和:9819

約数の個数: 64

約数和(自身を含む): 209658960

約数和(自身を除く): 128231120

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 260, 320, 416, 520, 640, 832, 1040, 1664, 2080, 4160, 8320, 9787, 19574, 39148, 48935, 78296, 97870, 127231, 156592, 195740, 254462, 313184, 391480, 508924, 626368, 636155, 782960, 1017848, 1252736, 1272310, 1565920, 2035696, 2544620, 3131840, 4071392, 5089240, 6263680, 8142784, 10178480, 16285568, 20356960, 40713920, 81427840]

約数ペア:

[(1, 81427840), (2, 40713920), (4, 20356960), (5, 16285568), (8, 10178480), (10, 8142784), (13, 6263680), (16, 5089240), (20, 4071392), (26, 3131840), (32, 2544620), (40, 2035696), (52, 1565920), (64, 1272310), (65, 1252736), (80, 1017848), (104, 782960), (128, 636155), (130, 626368), (160, 508924), (208, 391480), (260, 313184), (320, 254462), (416, 195740), (520, 156592), (640, 127231), (832, 97870), (1040, 78296), (1664, 48935), (2080, 39148), (4160, 19574), (8320, 9787)]