21981325

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{113}}^1\times {\mathrm{251}}^1$

素因数の和:405

約数の個数: 24

約数和(自身を含む): 28498176

約数和(自身を除く): 6516851

約数列:

[1, 5, 25, 31, 113, 155, 251, 565, 775, 1255, 2825, 3503, 6275, 7781, 17515, 28363, 38905, 87575, 141815, 194525, 709075, 879253, 4396265, 21981325]

約数ペア:

[(1, 21981325), (5, 4396265), (25, 879253), (31, 709075), (113, 194525), (155, 141815), (251, 87575), (565, 38905), (775, 28363), (1255, 17515), (2825, 7781), (3503, 6275)]