21280025

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{1597}}^1$

素因数の和:1661

約数の個数: 24

約数和(自身を含む): 29128344

約数和(自身を除く): 7848319

約数列:

[1, 5, 13, 25, 41, 65, 205, 325, 533, 1025, 1597, 2665, 7985, 13325, 20761, 39925, 65477, 103805, 327385, 519025, 851201, 1636925, 4256005, 21280025]

約数ペア:

[(1, 21280025), (5, 4256005), (13, 1636925), (25, 851201), (41, 519025), (65, 327385), (205, 103805), (325, 65477), (533, 39925), (1025, 20761), (1597, 13325), (2665, 7985)]