21135440

素因数分解:

$2^4\times 5^1\times {\mathrm{349}}^1\times {\mathrm{757}}^1$

素因数の和:1119

約数の個数: 40

約数和(自身を含む): 49345800

約数和(自身を除く): 28210360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 349, 698, 757, 1396, 1514, 1745, 2792, 3028, 3490, 3785, 5584, 6056, 6980, 7570, 12112, 13960, 15140, 27920, 30280, 60560, 264193, 528386, 1056772, 1320965, 2113544, 2641930, 4227088, 5283860, 10567720, 21135440]

約数ペア:

[(1, 21135440), (2, 10567720), (4, 5283860), (5, 4227088), (8, 2641930), (10, 2113544), (16, 1320965), (20, 1056772), (40, 528386), (80, 264193), (349, 60560), (698, 30280), (757, 27920), (1396, 15140), (1514, 13960), (1745, 12112), (2792, 7570), (3028, 6980), (3490, 6056), (3785, 5584)]