21709840

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{6311}}^1$

素因数の和:6367

約数の個数: 40

約数和(自身を含む): 51657408

約数和(自身を除く): 29947568

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 6311, 12622, 25244, 31555, 50488, 63110, 100976, 126220, 252440, 271373, 504880, 542746, 1085492, 1356865, 2170984, 2713730, 4341968, 5427460, 10854920, 21709840]

約数ペア:

[(1, 21709840), (2, 10854920), (4, 5427460), (5, 4341968), (8, 2713730), (10, 2170984), (16, 1356865), (20, 1085492), (40, 542746), (43, 504880), (80, 271373), (86, 252440), (172, 126220), (215, 100976), (344, 63110), (430, 50488), (688, 31555), (860, 25244), (1720, 12622), (3440, 6311)]