19202020

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{30971}}^1$

素因数の和:31011

約数の個数: 24

約数和(自身を含む): 41626368

約数和(自身を除く): 22424348

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620, 30971, 61942, 123884, 154855, 309710, 619420, 960101, 1920202, 3840404, 4800505, 9601010, 19202020]

約数ペア:

[(1, 19202020), (2, 9601010), (4, 4800505), (5, 3840404), (10, 1920202), (20, 960101), (31, 619420), (62, 309710), (124, 154855), (155, 123884), (310, 61942), (620, 30971)]