20851721

素因数分解:

${\mathrm{11}}^1\times {\mathrm{19}}^2\times {\mathrm{59}}^1\times {\mathrm{89}}^1$

素因数の和:197

約数の個数: 24

約数和(自身を含む): 24688800

約数和(自身を除く): 3837079

約数列:

[1, 11, 19, 59, 89, 209, 361, 649, 979, 1121, 1691, 3971, 5251, 12331, 18601, 21299, 32129, 57761, 99769, 234289, 353419, 1097459, 1895611, 20851721]

約数ペア:

[(1, 20851721), (11, 1895611), (19, 1097459), (59, 353419), (89, 234289), (209, 99769), (361, 57761), (649, 32129), (979, 21299), (1121, 18601), (1691, 12331), (3971, 5251)]