21705775

素因数分解:

$5^2\times 7^2\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{47}}^1$

素因数の和:113

約数の個数: 72

約数和(自身を含む): 35622720

約数和(自身を除く): 13916945

約数列:

[1, 5, 7, 13, 25, 29, 35, 47, 49, 65, 91, 145, 175, 203, 235, 245, 325, 329, 377, 455, 611, 637, 725, 1015, 1175, 1225, 1363, 1421, 1645, 1885, 2275, 2303, 2639, 3055, 3185, 4277, 5075, 6815, 7105, 8225, 9425, 9541, 11515, 13195, 15275, 15925, 17719, 18473, 21385, 29939, 34075, 35525, 47705, 57575, 65975, 66787, 88595, 92365, 106925, 124033, 149695, 238525, 333935, 442975, 461825, 620165, 748475, 868231, 1669675, 3100825, 4341155, 21705775]

約数ペア:

[(1, 21705775), (5, 4341155), (7, 3100825), (13, 1669675), (25, 868231), (29, 748475), (35, 620165), (47, 461825), (49, 442975), (65, 333935), (91, 238525), (145, 149695), (175, 124033), (203, 106925), (235, 92365), (245, 88595), (325, 66787), (329, 65975), (377, 57575), (455, 47705), (611, 35525), (637, 34075), (725, 29939), (1015, 21385), (1175, 18473), (1225, 17719), (1363, 15925), (1421, 15275), (1645, 13195), (1885, 11515), (2275, 9541), (2303, 9425), (2639, 8225), (3055, 7105), (3185, 6815), (4277, 5075)]