21380975

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{383}}^1$

素因数の和:440

約数の個数: 48

約数和(自身を含む): 34283520

約数和(自身を除く): 12902545

約数列:

[1, 5, 7, 11, 25, 29, 35, 55, 77, 145, 175, 203, 275, 319, 383, 385, 725, 1015, 1595, 1915, 1925, 2233, 2681, 4213, 5075, 7975, 9575, 11107, 11165, 13405, 21065, 29491, 55535, 55825, 67025, 77749, 105325, 122177, 147455, 277675, 388745, 610885, 737275, 855239, 1943725, 3054425, 4276195, 21380975]

約数ペア:

[(1, 21380975), (5, 4276195), (7, 3054425), (11, 1943725), (25, 855239), (29, 737275), (35, 610885), (55, 388745), (77, 277675), (145, 147455), (175, 122177), (203, 105325), (275, 77749), (319, 67025), (383, 55825), (385, 55535), (725, 29491), (1015, 21065), (1595, 13405), (1915, 11165), (1925, 11107), (2233, 9575), (2681, 7975), (4213, 5075)]