21678315

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{151}}^1\times {\mathrm{563}}^1$

素因数の和:739

約数の個数: 32

約数和(自身を含む): 37034496

約数和(自身を除く): 15356181

約数列:

[1, 3, 5, 15, 17, 51, 85, 151, 255, 453, 563, 755, 1689, 2265, 2567, 2815, 7701, 8445, 9571, 12835, 28713, 38505, 47855, 85013, 143565, 255039, 425065, 1275195, 1445221, 4335663, 7226105, 21678315]

約数ペア:

[(1, 21678315), (3, 7226105), (5, 4335663), (15, 1445221), (17, 1275195), (51, 425065), (85, 255039), (151, 143565), (255, 85013), (453, 47855), (563, 38505), (755, 28713), (1689, 12835), (2265, 9571), (2567, 8445), (2815, 7701)]