21125745

素因数分解:

$3^3\times 5^1\times {\mathrm{156487}}^1$

素因数の和:156501

約数の個数: 16

約数和(自身を含む): 37557120

約数和(自身を除く): 16431375

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 156487, 469461, 782435, 1408383, 2347305, 4225149, 7041915, 21125745]

約数ペア:

[(1, 21125745), (3, 7041915), (5, 4225149), (9, 2347305), (15, 1408383), (27, 782435), (45, 469461), (135, 156487)]