21189981

素因数分解:

$3^1\times {\mathrm{29}}^1\times {\mathrm{151}}^1\times {\mathrm{1613}}^1$

素因数の和:1796

約数の個数: 16

約数和(自身を含む): 29439360

約数和(自身を除く): 8249379

約数列:

[1, 3, 29, 87, 151, 453, 1613, 4379, 4839, 13137, 46777, 140331, 243563, 730689, 7063327, 21189981]

約数ペア:

[(1, 21189981), (3, 7063327), (29, 730689), (87, 243563), (151, 140331), (453, 46777), (1613, 13137), (4379, 4839)]