20644375

素因数分解:

$5^4\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{67}}^1$

素因数の和:133

約数の個数: 40

約数和(自身を含む): 28678320

約数和(自身を除く): 8033945

約数列:

[1, 5, 17, 25, 29, 67, 85, 125, 145, 335, 425, 493, 625, 725, 1139, 1675, 1943, 2125, 2465, 3625, 5695, 8375, 9715, 10625, 12325, 18125, 28475, 33031, 41875, 48575, 61625, 142375, 165155, 242875, 308125, 711875, 825775, 1214375, 4128875, 20644375]

約数ペア:

[(1, 20644375), (5, 4128875), (17, 1214375), (25, 825775), (29, 711875), (67, 308125), (85, 242875), (125, 165155), (145, 142375), (335, 61625), (425, 48575), (493, 41875), (625, 33031), (725, 28475), (1139, 18125), (1675, 12325), (1943, 10625), (2125, 9715), (2465, 8375), (3625, 5695)]