21109540

素因数分解:

$2^2\times 5^1\times {\mathrm{971}}^1\times {\mathrm{1087}}^1$

素因数の和:2067

約数の個数: 24

約数和(自身を含む): 44416512

約数和(自身を除く): 23306972

約数列:

[1, 2, 4, 5, 10, 20, 971, 1087, 1942, 2174, 3884, 4348, 4855, 5435, 9710, 10870, 19420, 21740, 1055477, 2110954, 4221908, 5277385, 10554770, 21109540]

約数ペア:

[(1, 21109540), (2, 10554770), (4, 5277385), (5, 4221908), (10, 2110954), (20, 1055477), (971, 21740), (1087, 19420), (1942, 10870), (2174, 9710), (3884, 5435), (4348, 4855)]