19913905

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{8831}}^1$

素因数の和:8888

約数の個数: 16

約数和(自身を含む): 26707968

約数和(自身を除く): 6794063

約数列:

[1, 5, 11, 41, 55, 205, 451, 2255, 8831, 44155, 97141, 362071, 485705, 1810355, 3982781, 19913905]

約数ペア:

[(1, 19913905), (5, 3982781), (11, 1810355), (41, 485705), (55, 362071), (205, 97141), (451, 44155), (2255, 8831)]