21919975

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{59}}^1\times {\mathrm{193}}^1$

素因数の和:280

約数の個数: 48

約数和(自身を含む): 34640640

約数和(自身を除く): 12720665

約数列:

[1, 5, 7, 11, 25, 35, 55, 59, 77, 175, 193, 275, 295, 385, 413, 649, 965, 1351, 1475, 1925, 2065, 2123, 3245, 4543, 4825, 6755, 10325, 10615, 11387, 14861, 16225, 22715, 33775, 53075, 56935, 74305, 79709, 113575, 125257, 284675, 371525, 398545, 626285, 876799, 1992725, 3131425, 4383995, 21919975]

約数ペア:

[(1, 21919975), (5, 4383995), (7, 3131425), (11, 1992725), (25, 876799), (35, 626285), (55, 398545), (59, 371525), (77, 284675), (175, 125257), (193, 113575), (275, 79709), (295, 74305), (385, 56935), (413, 53075), (649, 33775), (965, 22715), (1351, 16225), (1475, 14861), (1925, 11387), (2065, 10615), (2123, 10325), (3245, 6755), (4543, 4825)]