81855280

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78707}}^1$

素因数の和:78733

約数の個数: 40

約数和(自身を含む): 204955632

約数和(自身を除く): 123100352

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78707, 157414, 314828, 393535, 629656, 787070, 1023191, 1259312, 1574140, 2046382, 3148280, 4092764, 5115955, 6296560, 8185528, 10231910, 16371056, 20463820, 40927640, 81855280]

約数ペア:

[(1, 81855280), (2, 40927640), (4, 20463820), (5, 16371056), (8, 10231910), (10, 8185528), (13, 6296560), (16, 5115955), (20, 4092764), (26, 3148280), (40, 2046382), (52, 1574140), (65, 1259312), (80, 1023191), (104, 787070), (130, 629656), (208, 393535), (260, 314828), (520, 157414), (1040, 78707)]