21505855

素因数分解:

$5^1\times 7^2\times {\mathrm{61}}^1\times {\mathrm{1439}}^1$

素因数の和:1519

約数の個数: 24

約数和(自身を含む): 30533760

約数和(自身を除く): 9027905

約数列:

[1, 5, 7, 35, 49, 61, 245, 305, 427, 1439, 2135, 2989, 7195, 10073, 14945, 50365, 70511, 87779, 352555, 438895, 614453, 3072265, 4301171, 21505855]

約数ペア:

[(1, 21505855), (5, 4301171), (7, 3072265), (35, 614453), (49, 438895), (61, 352555), (245, 87779), (305, 70511), (427, 50365), (1439, 14945), (2135, 10073), (2989, 7195)]