28781980

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{20269}}^1$

素因数の和:20349

約数の個数: 24

約数和(自身を含む): 61296480

約数和(自身を除く): 32514500

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 20269, 40538, 81076, 101345, 202690, 405380, 1439099, 2878198, 5756396, 7195495, 14390990, 28781980]

約数ペア:

[(1, 28781980), (2, 14390990), (4, 7195495), (5, 5756396), (10, 2878198), (20, 1439099), (71, 405380), (142, 202690), (284, 101345), (355, 81076), (710, 40538), (1420, 20269)]