81321980

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{57269}}^1$

素因数の和:57349

約数の個数: 24

約数和(自身を含む): 173184480

約数和(自身を除く): 91862500

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 57269, 114538, 229076, 286345, 572690, 1145380, 4066099, 8132198, 16264396, 20330495, 40660990, 81321980]

約数ペア:

[(1, 81321980), (2, 40660990), (4, 20330495), (5, 16264396), (10, 8132198), (20, 4066099), (71, 1145380), (142, 572690), (284, 286345), (355, 229076), (710, 114538), (1420, 57269)]