20991651

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{523}}^1\times {\mathrm{787}}^1$

素因数の和:1330

約数の個数: 16

約数和(自身を含む): 29729664

約数和(自身を除く): 8738013

約数列:

[1, 3, 17, 51, 523, 787, 1569, 2361, 8891, 13379, 26673, 40137, 411601, 1234803, 6997217, 20991651]

約数ペア:

[(1, 20991651), (3, 6997217), (17, 1234803), (51, 411601), (523, 40137), (787, 26673), (1569, 13379), (2361, 8891)]