21203945

素因数分解:

$5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{193}}^1$

素因数の和:321

約数の個数: 32

約数和(自身を含む): 30319872

約数和(自身を除く): 9115927

約数列:

[1, 5, 7, 35, 43, 73, 193, 215, 301, 365, 511, 965, 1351, 1505, 2555, 3139, 6755, 8299, 14089, 15695, 21973, 41495, 58093, 70445, 98623, 109865, 290465, 493115, 605827, 3029135, 4240789, 21203945]

約数ペア:

[(1, 21203945), (5, 4240789), (7, 3029135), (35, 605827), (43, 493115), (73, 290465), (193, 109865), (215, 98623), (301, 70445), (365, 58093), (511, 41495), (965, 21973), (1351, 15695), (1505, 14089), (2555, 8299), (3139, 6755)]