21181538

素因数分解:

$2^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{103}}^1\times {\mathrm{397}}^1$

素因数の和:546

約数の個数: 32

約数和(自身を含む): 37749504

約数和(自身を除く): 16567966

約数列:

[1, 2, 7, 14, 37, 74, 103, 206, 259, 397, 518, 721, 794, 1442, 2779, 3811, 5558, 7622, 14689, 26677, 29378, 40891, 53354, 81782, 102823, 205646, 286237, 572474, 1512967, 3025934, 10590769, 21181538]

約数ペア:

[(1, 21181538), (2, 10590769), (7, 3025934), (14, 1512967), (37, 572474), (74, 286237), (103, 205646), (206, 102823), (259, 81782), (397, 53354), (518, 40891), (721, 29378), (794, 26677), (1442, 14689), (2779, 7622), (3811, 5558)]