21195915

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{1489}}^1$

素因数の和:1583

約数の個数: 32

約数和(自身を含む): 37047360

約数和(自身を除く): 15851445

約数列:

[1, 3, 5, 13, 15, 39, 65, 73, 195, 219, 365, 949, 1095, 1489, 2847, 4467, 4745, 7445, 14235, 19357, 22335, 58071, 96785, 108697, 290355, 326091, 543485, 1413061, 1630455, 4239183, 7065305, 21195915]

約数ペア:

[(1, 21195915), (3, 7065305), (5, 4239183), (13, 1630455), (15, 1413061), (39, 543485), (65, 326091), (73, 290355), (195, 108697), (219, 96785), (365, 58071), (949, 22335), (1095, 19357), (1489, 14235), (2847, 7445), (4467, 4745)]