21129332357

素因数分解:

$7^1\times {\mathrm{73}}^1\times {\mathrm{251}}^1\times {\mathrm{257}}^1\times {\mathrm{641}}^1$

素因数の和:1229

約数の個数: 32

約数和(自身を含む): 24710241024

約数和(自身を除く): 3580908667

約数列:

[1, 7, 73, 251, 257, 511, 641, 1757, 1799, 4487, 18323, 18761, 46793, 64507, 128261, 131327, 160891, 164737, 327551, 451549, 1126237, 1153159, 4709011, 11745043, 12025801, 32963077, 41348987, 82215301, 84180607, 289442909, 3018476051, 21129332357]

約数ペア:

[(1, 21129332357), (7, 3018476051), (73, 289442909), (251, 84180607), (257, 82215301), (511, 41348987), (641, 32963077), (1757, 12025801), (1799, 11745043), (4487, 4709011), (18323, 1153159), (18761, 1126237), (46793, 451549), (64507, 327551), (128261, 164737), (131327, 160891)]