21116120

素因数分解:

$2^3\times 5^1\times {\mathrm{643}}^1\times {\mathrm{821}}^1$

素因数の和:1475

約数の個数: 32

約数和(自身を含む): 47643120

約数和(自身を除く): 26527000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 643, 821, 1286, 1642, 2572, 3215, 3284, 4105, 5144, 6430, 6568, 8210, 12860, 16420, 25720, 32840, 527903, 1055806, 2111612, 2639515, 4223224, 5279030, 10558060, 21116120]

約数ペア:

[(1, 21116120), (2, 10558060), (4, 5279030), (5, 4223224), (8, 2639515), (10, 2111612), (20, 1055806), (40, 527903), (643, 32840), (821, 25720), (1286, 16420), (1642, 12860), (2572, 8210), (3215, 6568), (3284, 6430), (4105, 5144)]