21871525

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{173}}^1\times {\mathrm{389}}^1$

素因数の和:585

約数の個数: 24

約数和(自身を含む): 29451240

約数和(自身を除く): 7579715

約数列:

[1, 5, 13, 25, 65, 173, 325, 389, 865, 1945, 2249, 4325, 5057, 9725, 11245, 25285, 56225, 67297, 126425, 336485, 874861, 1682425, 4374305, 21871525]

約数ペア:

[(1, 21871525), (5, 4374305), (13, 1682425), (25, 874861), (65, 336485), (173, 126425), (325, 67297), (389, 56225), (865, 25285), (1945, 11245), (2249, 9725), (4325, 5057)]