18810280

素因数分解:

$2^3\times 5^1\times {\mathrm{421}}^1\times {\mathrm{1117}}^1$

素因数の和:1549

約数の個数: 32

約数和(自身を含む): 42461640

約数和(自身を除く): 23651360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 421, 842, 1117, 1684, 2105, 2234, 3368, 4210, 4468, 5585, 8420, 8936, 11170, 16840, 22340, 44680, 470257, 940514, 1881028, 2351285, 3762056, 4702570, 9405140, 18810280]

約数ペア:

[(1, 18810280), (2, 9405140), (4, 4702570), (5, 3762056), (8, 2351285), (10, 1881028), (20, 940514), (40, 470257), (421, 44680), (842, 22340), (1117, 16840), (1684, 11170), (2105, 8936), (2234, 8420), (3368, 5585), (4210, 4468)]