21128517

素因数分解:

$3^2\times {\mathrm{37}}^1\times {\mathrm{67}}^1\times {\mathrm{947}}^1$

素因数の和:1057

約数の個数: 24

約数和(自身を含む): 31845216

約数和(自身を除く): 10716699

約数列:

[1, 3, 9, 37, 67, 111, 201, 333, 603, 947, 2479, 2841, 7437, 8523, 22311, 35039, 63449, 105117, 190347, 315351, 571041, 2347613, 7042839, 21128517]

約数ペア:

[(1, 21128517), (3, 7042839), (9, 2347613), (37, 571041), (67, 315351), (111, 190347), (201, 105117), (333, 63449), (603, 35039), (947, 22311), (2479, 8523), (2841, 7437)]