21890320

素因数分解:

$2^4\times 5^1\times {\mathrm{273629}}^1$

素因数の和:273642

約数の個数: 20

約数和(自身を含む): 50895180

約数和(自身を除く): 29004860

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 273629, 547258, 1094516, 1368145, 2189032, 2736290, 4378064, 5472580, 10945160, 21890320]

約数ペア:

[(1, 21890320), (2, 10945160), (4, 5472580), (5, 4378064), (8, 2736290), (10, 2189032), (16, 1368145), (20, 1094516), (40, 547258), (80, 273629)]