21256991

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{6949}}^1$

素因数の和:6998

約数の個数: 16

約数和(自身を含む): 26688000

約数和(自身を除く): 5431009

約数列:

[1, 7, 19, 23, 133, 161, 437, 3059, 6949, 48643, 132031, 159827, 924217, 1118789, 3036713, 21256991]

約数ペア:

[(1, 21256991), (7, 3036713), (19, 1118789), (23, 924217), (133, 159827), (161, 132031), (437, 48643), (3059, 6949)]