21097520

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{6133}}^1$

素因数の和:6189

約数の個数: 40

約数和(自身を含む): 50200656

約数和(自身を除く): 29103136

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 6133, 12266, 24532, 30665, 49064, 61330, 98128, 122660, 245320, 263719, 490640, 527438, 1054876, 1318595, 2109752, 2637190, 4219504, 5274380, 10548760, 21097520]

約数ペア:

[(1, 21097520), (2, 10548760), (4, 5274380), (5, 4219504), (8, 2637190), (10, 2109752), (16, 1318595), (20, 1054876), (40, 527438), (43, 490640), (80, 263719), (86, 245320), (172, 122660), (215, 98128), (344, 61330), (430, 49064), (688, 30665), (860, 24532), (1720, 12266), (3440, 6133)]