21322580

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9781}}^1$

素因数の和:9899

約数の個数: 24

約数和(自身を含む): 45192840

約数和(自身を除く): 23870260

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 9781, 19562, 39124, 48905, 97810, 195620, 1066129, 2132258, 4264516, 5330645, 10661290, 21322580]

約数ペア:

[(1, 21322580), (2, 10661290), (4, 5330645), (5, 4264516), (10, 2132258), (20, 1066129), (109, 195620), (218, 97810), (436, 48905), (545, 39124), (1090, 19562), (2180, 9781)]