21105680

素因数分解:

$2^4\times 5^1\times {\mathrm{263821}}^1$

素因数の和:263834

約数の個数: 20

約数和(自身を含む): 49070892

約数和(自身を除く): 27965212

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263821, 527642, 1055284, 1319105, 2110568, 2638210, 4221136, 5276420, 10552840, 21105680]

約数ペア:

[(1, 21105680), (2, 10552840), (4, 5276420), (5, 4221136), (8, 2638210), (10, 2110568), (16, 1319105), (20, 1055284), (40, 527642), (80, 263821)]