20881015

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{197}}^1$

素因数の和:291

約数の個数: 32

約数和(自身を含む): 28226880

約数和(自身を除く): 7345865

約数列:

[1, 5, 17, 29, 43, 85, 145, 197, 215, 493, 731, 985, 1247, 2465, 3349, 3655, 5713, 6235, 8471, 16745, 21199, 28565, 42355, 97121, 105995, 144007, 245659, 485605, 720035, 1228295, 4176203, 20881015]

約数ペア:

[(1, 20881015), (5, 4176203), (17, 1228295), (29, 720035), (43, 485605), (85, 245659), (145, 144007), (197, 105995), (215, 97121), (493, 42355), (731, 28565), (985, 21199), (1247, 16745), (2465, 8471), (3349, 6235), (3655, 5713)]