21018447

素因数分解:

$3^4\times {\mathrm{47}}^1\times {\mathrm{5521}}^1$

素因数の和:5580

約数の個数: 20

約数和(自身を含む): 32071776

約数和(自身を除く): 11053329

約数列:

[1, 3, 9, 27, 47, 81, 141, 423, 1269, 3807, 5521, 16563, 49689, 149067, 259487, 447201, 778461, 2335383, 7006149, 21018447]

約数ペア:

[(1, 21018447), (3, 7006149), (9, 2335383), (27, 778461), (47, 447201), (81, 259487), (141, 149067), (423, 49689), (1269, 16563), (3807, 5521)]