21385413

素因数分解:

$3^2\times 7^2\times {\mathrm{71}}^1\times {\mathrm{683}}^1$

素因数の和:774

約数の個数: 36

約数和(自身を含む): 36492768

約数和(自身を除く): 15107355

約数列:

[1, 3, 7, 9, 21, 49, 63, 71, 147, 213, 441, 497, 639, 683, 1491, 2049, 3479, 4473, 4781, 6147, 10437, 14343, 31311, 33467, 43029, 48493, 100401, 145479, 301203, 339451, 436437, 1018353, 2376157, 3055059, 7128471, 21385413]

約数ペア:

[(1, 21385413), (3, 7128471), (7, 3055059), (9, 2376157), (21, 1018353), (49, 436437), (63, 339451), (71, 301203), (147, 145479), (213, 100401), (441, 48493), (497, 43029), (639, 33467), (683, 31311), (1491, 14343), (2049, 10437), (3479, 6147), (4473, 4781)]