21007825

素因数分解:

$5^2\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{941}}^1$

素因数の和:1017

約数の個数: 24

約数和(自身を含む): 28033920

約数和(自身を除く): 7026095

約数列:

[1, 5, 19, 25, 47, 95, 235, 475, 893, 941, 1175, 4465, 4705, 17879, 22325, 23525, 44227, 89395, 221135, 446975, 840313, 1105675, 4201565, 21007825]

約数ペア:

[(1, 21007825), (5, 4201565), (19, 1105675), (25, 840313), (47, 446975), (95, 221135), (235, 89395), (475, 44227), (893, 23525), (941, 22325), (1175, 17879), (4465, 4705)]