20891440

素因数分解:

$2^4\times 5^1\times {\mathrm{113}}^1\times {\mathrm{2311}}^1$

素因数の和:2437

約数の個数: 40

約数和(自身を含む): 49023648

約数和(自身を除く): 28132208

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 113, 226, 452, 565, 904, 1130, 1808, 2260, 2311, 4520, 4622, 9040, 9244, 11555, 18488, 23110, 36976, 46220, 92440, 184880, 261143, 522286, 1044572, 1305715, 2089144, 2611430, 4178288, 5222860, 10445720, 20891440]

約数ペア:

[(1, 20891440), (2, 10445720), (4, 5222860), (5, 4178288), (8, 2611430), (10, 2089144), (16, 1305715), (20, 1044572), (40, 522286), (80, 261143), (113, 184880), (226, 92440), (452, 46220), (565, 36976), (904, 23110), (1130, 18488), (1808, 11555), (2260, 9244), (2311, 9040), (4520, 4622)]