21128180

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{14879}}^1$

素因数の和:14959

約数の個数: 24

約数和(自身を含む): 44997120

約数和(自身を除く): 23868940

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 14879, 29758, 59516, 74395, 148790, 297580, 1056409, 2112818, 4225636, 5282045, 10564090, 21128180]

約数ペア:

[(1, 21128180), (2, 10564090), (4, 5282045), (5, 4225636), (10, 2112818), (20, 1056409), (71, 297580), (142, 148790), (284, 74395), (355, 59516), (710, 29758), (1420, 14879)]