21561189

素因数分解:

$3^1\times {\mathrm{13}}^2\times {\mathrm{23}}^1\times {\mathrm{43}}^2$

素因数の和:138

約数の個数: 36

約数和(自身を含む): 33256224

約数和(自身を除く): 11695035

約数列:

[1, 3, 13, 23, 39, 43, 69, 129, 169, 299, 507, 559, 897, 989, 1677, 1849, 2967, 3887, 5547, 7267, 11661, 12857, 21801, 24037, 38571, 42527, 72111, 127581, 167141, 312481, 501423, 552851, 937443, 1658553, 7187063, 21561189]

約数ペア:

[(1, 21561189), (3, 7187063), (13, 1658553), (23, 937443), (39, 552851), (43, 501423), (69, 312481), (129, 167141), (169, 127581), (299, 72111), (507, 42527), (559, 38571), (897, 24037), (989, 21801), (1677, 12857), (1849, 11661), (2967, 7267), (3887, 5547)]