19891955

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{113}}^1$

素因数の和:263

約数の個数: 32

約数和(自身を含む): 27086400

約数和(自身を除く): 7194445

約数列:

[1, 5, 17, 19, 85, 95, 109, 113, 323, 545, 565, 1615, 1853, 1921, 2071, 2147, 9265, 9605, 10355, 10735, 12317, 35207, 36499, 61585, 176035, 182495, 209389, 234023, 1046945, 1170115, 3978391, 19891955]

約数ペア:

[(1, 19891955), (5, 3978391), (17, 1170115), (19, 1046945), (85, 234023), (95, 209389), (109, 182495), (113, 176035), (323, 61585), (545, 36499), (565, 35207), (1615, 12317), (1853, 10735), (1921, 10355), (2071, 9605), (2147, 9265)]