21507905

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{4817}}^1$

素因数の和:4888

約数の個数: 16

約数和(自身を含む): 27751680

約数和(自身を除く): 6243775

約数列:

[1, 5, 19, 47, 95, 235, 893, 4465, 4817, 24085, 91523, 226399, 457615, 1131995, 4301581, 21507905]

約数ペア:

[(1, 21507905), (5, 4301581), (19, 1131995), (47, 457615), (95, 226399), (235, 91523), (893, 24085), (4465, 4817)]