21819920

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{6343}}^1$

素因数の和:6399

約数の個数: 40

約数和(自身を含む): 51919296

約数和(自身を除く): 30099376

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 6343, 12686, 25372, 31715, 50744, 63430, 101488, 126860, 253720, 272749, 507440, 545498, 1090996, 1363745, 2181992, 2727490, 4363984, 5454980, 10909960, 21819920]

約数ペア:

[(1, 21819920), (2, 10909960), (4, 5454980), (5, 4363984), (8, 2727490), (10, 2181992), (16, 1363745), (20, 1090996), (40, 545498), (43, 507440), (80, 272749), (86, 253720), (172, 126860), (215, 101488), (344, 63430), (430, 50744), (688, 31715), (860, 25372), (1720, 12686), (3440, 6343)]