20721147

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1$

素因数の和:275

約数の個数: 32

約数和(自身を含む): 30643200

約数和(自身を除く): 9922053

約数列:

[1, 3, 17, 37, 51, 79, 111, 139, 237, 417, 629, 1343, 1887, 2363, 2923, 4029, 5143, 7089, 8769, 10981, 15429, 32943, 49691, 87431, 149073, 186677, 262293, 406297, 560031, 1218891, 6907049, 20721147]

約数ペア:

[(1, 20721147), (3, 6907049), (17, 1218891), (37, 560031), (51, 406297), (79, 262293), (111, 186677), (139, 149073), (237, 87431), (417, 49691), (629, 32943), (1343, 15429), (1887, 10981), (2363, 8769), (2923, 7089), (4029, 5143)]