21039225

素因数分解:

$3^1\times 5^2\times {\mathrm{163}}^1\times {\mathrm{1721}}^1$

素因数の和:1897

約数の個数: 24

約数和(自身を含む): 35018592

約数和(自身を除く): 13979367

約数列:

[1, 3, 5, 15, 25, 75, 163, 489, 815, 1721, 2445, 4075, 5163, 8605, 12225, 25815, 43025, 129075, 280523, 841569, 1402615, 4207845, 7013075, 21039225]

約数ペア:

[(1, 21039225), (3, 7013075), (5, 4207845), (15, 1402615), (25, 841569), (75, 280523), (163, 129075), (489, 43025), (815, 25815), (1721, 12225), (2445, 8605), (4075, 5163)]