21991075

素因数分解:

$5^2\times {\mathrm{19}}^1\times {\mathrm{67}}^1\times {\mathrm{691}}^1$

素因数の和:787

約数の個数: 24

約数和(自身を含む): 29174720

約数和(自身を除く): 7183645

約数列:

[1, 5, 19, 25, 67, 95, 335, 475, 691, 1273, 1675, 3455, 6365, 13129, 17275, 31825, 46297, 65645, 231485, 328225, 879643, 1157425, 4398215, 21991075]

約数ペア:

[(1, 21991075), (5, 4398215), (19, 1157425), (25, 879643), (67, 328225), (95, 231485), (335, 65645), (475, 46297), (691, 31825), (1273, 17275), (1675, 13129), (3455, 6365)]