640750825

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{811}}^1$

素因数の和:875

約数の個数: 72

約数和(自身を含む): 994998816

約数和(自身を除く): 354247991

約数列:

[1, 5, 11, 13, 17, 25, 55, 65, 85, 143, 169, 187, 221, 275, 325, 425, 715, 811, 845, 935, 1105, 1859, 2431, 2873, 3575, 4055, 4225, 4675, 5525, 8921, 9295, 10543, 12155, 13787, 14365, 20275, 31603, 44605, 46475, 52715, 60775, 68935, 71825, 115973, 137059, 151657, 158015, 179231, 223025, 263575, 344675, 579865, 685295, 758285, 790075, 896155, 1507649, 1971541, 2330003, 2899325, 3426475, 3791425, 4480775, 7538245, 9857705, 11650015, 25630033, 37691225, 49288525, 58250075, 128150165, 640750825]

約数ペア:

[(1, 640750825), (5, 128150165), (11, 58250075), (13, 49288525), (17, 37691225), (25, 25630033), (55, 11650015), (65, 9857705), (85, 7538245), (143, 4480775), (169, 3791425), (187, 3426475), (221, 2899325), (275, 2330003), (325, 1971541), (425, 1507649), (715, 896155), (811, 790075), (845, 758285), (935, 685295), (1105, 579865), (1859, 344675), (2431, 263575), (2873, 223025), (3575, 179231), (4055, 158015), (4225, 151657), (4675, 137059), (5525, 115973), (8921, 71825), (9295, 68935), (10543, 60775), (12155, 52715), (13787, 46475), (14365, 44605), (20275, 31603)]