21657755

素因数分解:

$5^1\times 7^2\times {\mathrm{109}}^1\times {\mathrm{811}}^1$

素因数の和:939

約数の個数: 24

約数和(自身を含む): 30547440

約数和(自身を除く): 8889685

約数列:

[1, 5, 7, 35, 49, 109, 245, 545, 763, 811, 3815, 4055, 5341, 5677, 26705, 28385, 39739, 88399, 198695, 441995, 618793, 3093965, 4331551, 21657755]

約数ペア:

[(1, 21657755), (5, 4331551), (7, 3093965), (35, 618793), (49, 441995), (109, 198695), (245, 88399), (545, 39739), (763, 28385), (811, 26705), (3815, 5677), (4055, 5341)]