21278725

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{233}}^1\times {\mathrm{281}}^1$

素因数の和:537

約数の個数: 24

約数和(自身を含む): 28638792

約数和(自身を除く): 7360067

約数列:

[1, 5, 13, 25, 65, 233, 281, 325, 1165, 1405, 3029, 3653, 5825, 7025, 15145, 18265, 65473, 75725, 91325, 327365, 851149, 1636825, 4255745, 21278725]

約数ペア:

[(1, 21278725), (5, 4255745), (13, 1636825), (25, 851149), (65, 327365), (233, 91325), (281, 75725), (325, 65473), (1165, 18265), (1405, 15145), (3029, 7025), (3653, 5825)]