21261890

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{23}}^1\times {\mathrm{547}}^1$

素因数の和:603

約数の個数: 48

約数和(自身を含む): 43322688

約数和(自身を除く): 22060798

約数列:

[1, 2, 5, 10, 13, 23, 26, 46, 65, 115, 130, 169, 230, 299, 338, 547, 598, 845, 1094, 1495, 1690, 2735, 2990, 3887, 5470, 7111, 7774, 12581, 14222, 19435, 25162, 35555, 38870, 62905, 71110, 92443, 125810, 163553, 184886, 327106, 462215, 817765, 924430, 1635530, 2126189, 4252378, 10630945, 21261890]

約数ペア:

[(1, 21261890), (2, 10630945), (5, 4252378), (10, 2126189), (13, 1635530), (23, 924430), (26, 817765), (46, 462215), (65, 327106), (115, 184886), (130, 163553), (169, 125810), (230, 92443), (299, 71110), (338, 62905), (547, 38870), (598, 35555), (845, 25162), (1094, 19435), (1495, 14222), (1690, 12581), (2735, 7774), (2990, 7111), (3887, 5470)]