21172885

素因数分解:

$5^1\times {\mathrm{83}}^1\times {\mathrm{163}}^1\times {\mathrm{313}}^1$

素因数の和:564

約数の個数: 16

約数和(自身を含む): 25953984

約数和(自身を除く): 4781099

約数列:

[1, 5, 83, 163, 313, 415, 815, 1565, 13529, 25979, 51019, 67645, 129895, 255095, 4234577, 21172885]

約数ペア:

[(1, 21172885), (5, 4234577), (83, 255095), (163, 129895), (313, 67645), (415, 51019), (815, 25979), (1565, 13529)]