21253995

素因数分解:

$3^6\times 5^1\times 7^3\times {\mathrm{17}}^1$

素因数の和:61

約数の個数: 112

約数和(自身を含む): 47217600

約数和(自身を除く): 25963605

約数列:

[1, 3, 5, 7, 9, 15, 17, 21, 27, 35, 45, 49, 51, 63, 81, 85, 105, 119, 135, 147, 153, 189, 243, 245, 255, 315, 343, 357, 405, 441, 459, 567, 595, 729, 735, 765, 833, 945, 1029, 1071, 1215, 1323, 1377, 1701, 1715, 1785, 2205, 2295, 2499, 2835, 3087, 3213, 3645, 3969, 4131, 4165, 5103, 5145, 5355, 5831, 6615, 6885, 7497, 8505, 9261, 9639, 11907, 12393, 12495, 15435, 16065, 17493, 19845, 20655, 22491, 25515, 27783, 28917, 29155, 35721, 37485, 46305, 48195, 52479, 59535, 61965, 67473, 83349, 86751, 87465, 112455, 138915, 144585, 157437, 178605, 202419, 250047, 262395, 337365, 416745, 433755, 472311, 607257, 787185, 1012095, 1250235, 1416933, 2361555, 3036285, 4250799, 7084665, 21253995]

約数ペア:

[(1, 21253995), (3, 7084665), (5, 4250799), (7, 3036285), (9, 2361555), (15, 1416933), (17, 1250235), (21, 1012095), (27, 787185), (35, 607257), (45, 472311), (49, 433755), (51, 416745), (63, 337365), (81, 262395), (85, 250047), (105, 202419), (119, 178605), (135, 157437), (147, 144585), (153, 138915), (189, 112455), (243, 87465), (245, 86751), (255, 83349), (315, 67473), (343, 61965), (357, 59535), (405, 52479), (441, 48195), (459, 46305), (567, 37485), (595, 35721), (729, 29155), (735, 28917), (765, 27783), (833, 25515), (945, 22491), (1029, 20655), (1071, 19845), (1215, 17493), (1323, 16065), (1377, 15435), (1701, 12495), (1715, 12393), (1785, 11907), (2205, 9639), (2295, 9261), (2499, 8505), (2835, 7497), (3087, 6885), (3213, 6615), (3645, 5831), (3969, 5355), (4131, 5145), (4165, 5103)]