21122020

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9689}}^1$

素因数の和:9807

約数の個数: 24

約数和(自身を含む): 44767800

約数和(自身を除く): 23645780

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 9689, 19378, 38756, 48445, 96890, 193780, 1056101, 2112202, 4224404, 5280505, 10561010, 21122020]

約数ペア:

[(1, 21122020), (2, 10561010), (4, 5280505), (5, 4224404), (10, 2112202), (20, 1056101), (109, 193780), (218, 96890), (436, 48445), (545, 38756), (1090, 19378), (2180, 9689)]