21990191

素因数分解:

${\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{97}}^1\times {\mathrm{103}}^1$

素因数の和:302

約数の個数: 16

約数和(自身を含む): 23482368

約数和(自身を除く): 1492177

約数列:

[1, 31, 71, 97, 103, 2201, 3007, 3193, 6887, 7313, 9991, 213497, 226703, 309721, 709361, 21990191]

約数ペア:

[(1, 21990191), (31, 709361), (71, 309721), (97, 226703), (103, 213497), (2201, 9991), (3007, 7313), (3193, 6887)]