21003948

素因数分解:

$2^2\times 3^7\times 7^4$

素因数の和:53

約数の個数: 120

約数和(自身を含む): 64310960

約数和(自身を除く): 43307012

約数列:

[1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 27, 28, 36, 42, 49, 54, 63, 81, 84, 98, 108, 126, 147, 162, 189, 196, 243, 252, 294, 324, 343, 378, 441, 486, 567, 588, 686, 729, 756, 882, 972, 1029, 1134, 1323, 1372, 1458, 1701, 1764, 2058, 2187, 2268, 2401, 2646, 2916, 3087, 3402, 3969, 4116, 4374, 4802, 5103, 5292, 6174, 6804, 7203, 7938, 8748, 9261, 9604, 10206, 11907, 12348, 14406, 15309, 15876, 18522, 20412, 21609, 23814, 27783, 28812, 30618, 35721, 37044, 43218, 47628, 55566, 61236, 64827, 71442, 83349, 86436, 107163, 111132, 129654, 142884, 166698, 194481, 214326, 250047, 259308, 333396, 388962, 428652, 500094, 583443, 750141, 777924, 1000188, 1166886, 1500282, 1750329, 2333772, 3000564, 3500658, 5250987, 7001316, 10501974, 21003948]

約数ペア:

[(1, 21003948), (2, 10501974), (3, 7001316), (4, 5250987), (6, 3500658), (7, 3000564), (9, 2333772), (12, 1750329), (14, 1500282), (18, 1166886), (21, 1000188), (27, 777924), (28, 750141), (36, 583443), (42, 500094), (49, 428652), (54, 388962), (63, 333396), (81, 259308), (84, 250047), (98, 214326), (108, 194481), (126, 166698), (147, 142884), (162, 129654), (189, 111132), (196, 107163), (243, 86436), (252, 83349), (294, 71442), (324, 64827), (343, 61236), (378, 55566), (441, 47628), (486, 43218), (567, 37044), (588, 35721), (686, 30618), (729, 28812), (756, 27783), (882, 23814), (972, 21609), (1029, 20412), (1134, 18522), (1323, 15876), (1372, 15309), (1458, 14406), (1701, 12348), (1764, 11907), (2058, 10206), (2187, 9604), (2268, 9261), (2401, 8748), (2646, 7938), (2916, 7203), (3087, 6804), (3402, 6174), (3969, 5292), (4116, 5103), (4374, 4802)]