20721554

素因数分解:

$2^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{109}}^1\times {\mathrm{367}}^1$

素因数の和:522

約数の個数: 32

約数和(自身を含む): 36917760

約数和(自身を除く): 16196206

約数列:

[1, 2, 7, 14, 37, 74, 109, 218, 259, 367, 518, 734, 763, 1526, 2569, 4033, 5138, 8066, 13579, 27158, 28231, 40003, 56462, 80006, 95053, 190106, 280021, 560042, 1480111, 2960222, 10360777, 20721554]

約数ペア:

[(1, 20721554), (2, 10360777), (7, 2960222), (14, 1480111), (37, 560042), (74, 280021), (109, 190106), (218, 95053), (259, 80006), (367, 56462), (518, 40003), (734, 28231), (763, 27158), (1526, 13579), (2569, 8066), (4033, 5138)]