21660925

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{83}}^1$

素因数の和:190

約数の個数: 48

約数和(自身を含む): 32372928

約数和(自身を除く): 10712003

約数列:

[1, 5, 11, 13, 25, 55, 65, 73, 83, 143, 275, 325, 365, 415, 715, 803, 913, 949, 1079, 1825, 2075, 3575, 4015, 4565, 4745, 5395, 6059, 10439, 11869, 20075, 22825, 23725, 26975, 30295, 52195, 59345, 66649, 78767, 151475, 260975, 296725, 333245, 393835, 866437, 1666225, 1969175, 4332185, 21660925]

約数ペア:

[(1, 21660925), (5, 4332185), (11, 1969175), (13, 1666225), (25, 866437), (55, 393835), (65, 333245), (73, 296725), (83, 260975), (143, 151475), (275, 78767), (325, 66649), (365, 59345), (415, 52195), (715, 30295), (803, 26975), (913, 23725), (949, 22825), (1079, 20075), (1825, 11869), (2075, 10439), (3575, 6059), (4015, 5395), (4565, 4745)]