20019025

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1987}}^1$

素因数の和:2041

約数の個数: 24

約数和(自身を含む): 27609344

約数和(自身を除く): 7590319

約数列:

[1, 5, 13, 25, 31, 65, 155, 325, 403, 775, 1987, 2015, 9935, 10075, 25831, 49675, 61597, 129155, 307985, 645775, 800761, 1539925, 4003805, 20019025]

約数ペア:

[(1, 20019025), (5, 4003805), (13, 1539925), (25, 800761), (31, 645775), (65, 307985), (155, 129155), (325, 61597), (403, 49675), (775, 25831), (1987, 10075), (2015, 9935)]