21139531

素因数分解:

$7^2\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{127}}^1$

素因数の和:263

約数の個数: 24

約数和(自身を含む): 25681920

約数和(自身を除く): 4542389

約数列:

[1, 7, 43, 49, 79, 127, 301, 553, 889, 2107, 3397, 3871, 5461, 6223, 10033, 23779, 38227, 70231, 166453, 267589, 431419, 491617, 3019933, 21139531]

約数ペア:

[(1, 21139531), (7, 3019933), (43, 491617), (49, 431419), (79, 267589), (127, 166453), (301, 70231), (553, 38227), (889, 23779), (2107, 10033), (3397, 6223), (3871, 5461)]