21356405

素因数分解:

$5^1\times 7^2\times {\mathrm{61}}^1\times {\mathrm{1429}}^1$

素因数の和:1509

約数の個数: 24

約数和(自身を含む): 30321720

約数和(自身を除く): 8965315

約数列:

[1, 5, 7, 35, 49, 61, 245, 305, 427, 1429, 2135, 2989, 7145, 10003, 14945, 50015, 70021, 87169, 350105, 435845, 610183, 3050915, 4271281, 21356405]

約数ペア:

[(1, 21356405), (5, 4271281), (7, 3050915), (35, 610183), (49, 435845), (61, 350105), (245, 87169), (305, 70021), (427, 50015), (1429, 14945), (2135, 10003), (2989, 7145)]