21286405

素因数分解:

$5^1\times 7^1\times {\mathrm{409}}^1\times {\mathrm{1487}}^1$

素因数の和:1908

約数の個数: 16

約数和(自身を含む): 29283840

約数和(自身を除く): 7997435

約数列:

[1, 5, 7, 35, 409, 1487, 2045, 2863, 7435, 10409, 14315, 52045, 608183, 3040915, 4257281, 21286405]

約数ペア:

[(1, 21286405), (5, 4257281), (7, 3040915), (35, 608183), (409, 52045), (1487, 14315), (2045, 10409), (2863, 7435)]