20781405

素因数分解:

$3^2\times 5^1\times {\mathrm{523}}^1\times {\mathrm{883}}^1$

素因数の和:1417

約数の個数: 24

約数和(自身を含む): 36130848

約数和(自身を除く): 15349443

約数列:

[1, 3, 5, 9, 15, 45, 523, 883, 1569, 2615, 2649, 4415, 4707, 7845, 7947, 13245, 23535, 39735, 461809, 1385427, 2309045, 4156281, 6927135, 20781405]

約数ペア:

[(1, 20781405), (3, 6927135), (5, 4156281), (9, 2309045), (15, 1385427), (45, 461809), (523, 39735), (883, 23535), (1569, 13245), (2615, 7947), (2649, 7845), (4415, 4707)]