21159440

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{6151}}^1$

素因数の和:6207

約数の個数: 40

約数和(自身を含む): 50347968

約数和(自身を除く): 29188528

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 6151, 12302, 24604, 30755, 49208, 61510, 98416, 123020, 246040, 264493, 492080, 528986, 1057972, 1322465, 2115944, 2644930, 4231888, 5289860, 10579720, 21159440]

約数ペア:

[(1, 21159440), (2, 10579720), (4, 5289860), (5, 4231888), (8, 2644930), (10, 2115944), (16, 1322465), (20, 1057972), (40, 528986), (43, 492080), (80, 264493), (86, 246040), (172, 123020), (215, 98416), (344, 61510), (430, 49208), (688, 30755), (860, 24604), (1720, 12302), (3440, 6151)]