21277640

素因数分解:

$2^3\times 5^1\times {\mathrm{521}}^1\times {\mathrm{1021}}^1$

素因数の和:1553

約数の個数: 32

約数和(自身を含む): 48013560

約数和(自身を除く): 26735920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 521, 1021, 1042, 2042, 2084, 2605, 4084, 4168, 5105, 5210, 8168, 10210, 10420, 20420, 20840, 40840, 531941, 1063882, 2127764, 2659705, 4255528, 5319410, 10638820, 21277640]

約数ペア:

[(1, 21277640), (2, 10638820), (4, 5319410), (5, 4255528), (8, 2659705), (10, 2127764), (20, 1063882), (40, 531941), (521, 40840), (1021, 20840), (1042, 20420), (2042, 10420), (2084, 10210), (2605, 8168), (4084, 5210), (4168, 5105)]