21138025

素因数分解:

$5^2\times {\mathrm{61}}^1\times {\mathrm{83}}^1\times {\mathrm{167}}^1$

素因数の和:321

約数の個数: 24

約数和(自身を含む): 27123264

約数和(自身を除く): 5985239

約数列:

[1, 5, 25, 61, 83, 167, 305, 415, 835, 1525, 2075, 4175, 5063, 10187, 13861, 25315, 50935, 69305, 126575, 254675, 346525, 845521, 4227605, 21138025]

約数ペア:

[(1, 21138025), (5, 4227605), (25, 845521), (61, 346525), (83, 254675), (167, 126575), (305, 69305), (415, 50935), (835, 25315), (1525, 13861), (2075, 10187), (4175, 5063)]