19974075

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{71}}^1$

素因数の和:137

約数の個数: 72

約数和(自身を含む): 37997568

約数和(自身を除く): 18023493

約数列:

[1, 3, 5, 11, 15, 25, 31, 33, 55, 71, 75, 93, 121, 155, 165, 213, 275, 341, 355, 363, 465, 605, 775, 781, 825, 1023, 1065, 1705, 1775, 1815, 2201, 2325, 2343, 3025, 3751, 3905, 5115, 5325, 6603, 8525, 8591, 9075, 11005, 11253, 11715, 18755, 19525, 24211, 25575, 25773, 33015, 42955, 55025, 56265, 58575, 72633, 93775, 121055, 128865, 165075, 214775, 266321, 281325, 363165, 605275, 644325, 798963, 1331605, 1815825, 3994815, 6658025, 19974075]

約数ペア:

[(1, 19974075), (3, 6658025), (5, 3994815), (11, 1815825), (15, 1331605), (25, 798963), (31, 644325), (33, 605275), (55, 363165), (71, 281325), (75, 266321), (93, 214775), (121, 165075), (155, 128865), (165, 121055), (213, 93775), (275, 72633), (341, 58575), (355, 56265), (363, 55025), (465, 42955), (605, 33015), (775, 25773), (781, 25575), (825, 24211), (1023, 19525), (1065, 18755), (1705, 11715), (1775, 11253), (1815, 11005), (2201, 9075), (2325, 8591), (2343, 8525), (3025, 6603), (3751, 5325), (3905, 5115)]