21279820

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25951}}^1$

素因数の和:26001

約数の個数: 24

約数和(自身を含む): 45779328

約数和(自身を除く): 24499508

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25951, 51902, 103804, 129755, 259510, 519020, 1063991, 2127982, 4255964, 5319955, 10639910, 21279820]

約数ペア:

[(1, 21279820), (2, 10639910), (4, 5319955), (5, 4255964), (10, 2127982), (20, 1063991), (41, 519020), (82, 259510), (164, 129755), (205, 103804), (410, 51902), (820, 25951)]