20791225

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{37}}^1$

素因数の和:99

約数の個数: 72

約数和(自身を含む): 34491840

約数和(自身を除く): 13700615

約数列:

[1, 5, 7, 13, 19, 25, 35, 37, 65, 91, 95, 133, 169, 175, 185, 247, 259, 325, 455, 475, 481, 665, 703, 845, 925, 1183, 1235, 1295, 1729, 2275, 2405, 3211, 3325, 3367, 3515, 4225, 4921, 5915, 6175, 6253, 6475, 8645, 9139, 12025, 16055, 16835, 17575, 22477, 24605, 29575, 31265, 43225, 43771, 45695, 63973, 80275, 84175, 112385, 118807, 123025, 156325, 218855, 228475, 319865, 561925, 594035, 831649, 1094275, 1599325, 2970175, 4158245, 20791225]

約数ペア:

[(1, 20791225), (5, 4158245), (7, 2970175), (13, 1599325), (19, 1094275), (25, 831649), (35, 594035), (37, 561925), (65, 319865), (91, 228475), (95, 218855), (133, 156325), (169, 123025), (175, 118807), (185, 112385), (247, 84175), (259, 80275), (325, 63973), (455, 45695), (475, 43771), (481, 43225), (665, 31265), (703, 29575), (845, 24605), (925, 22477), (1183, 17575), (1235, 16835), (1295, 16055), (1729, 12025), (2275, 9139), (2405, 8645), (3211, 6475), (3325, 6253), (3367, 6175), (3515, 5915), (4225, 4921)]