21787025

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{1559}}^1$

素因数の和:1625

約数の個数: 24

約数和(自身を含む): 29789760

約数和(自身を除く): 8002735

約数列:

[1, 5, 13, 25, 43, 65, 215, 325, 559, 1075, 1559, 2795, 7795, 13975, 20267, 38975, 67037, 101335, 335185, 506675, 871481, 1675925, 4357405, 21787025]

約数ペア:

[(1, 21787025), (5, 4357405), (13, 1675925), (25, 871481), (43, 506675), (65, 335185), (215, 101335), (325, 67037), (559, 38975), (1075, 20267), (1559, 13975), (2795, 7795)]