21681980

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{15269}}^1$

素因数の和:15349

約数の個数: 24

約数和(自身を含む): 46176480

約数和(自身を除く): 24494500

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 15269, 30538, 61076, 76345, 152690, 305380, 1084099, 2168198, 4336396, 5420495, 10840990, 21681980]

約数ペア:

[(1, 21681980), (2, 10840990), (4, 5420495), (5, 4336396), (10, 2168198), (20, 1084099), (71, 305380), (142, 152690), (284, 76345), (355, 61076), (710, 30538), (1420, 15269)]