21781872

素因数分解:

$2^4\times 3^4\times 7^5$

素因数の和:55

約数の個数: 150

約数和(自身を含む): 73549608

約数和(自身を除く): 51767736

約数列:

[1, 2, 3, 4, 6, 7, 8, 9, 12, 14, 16, 18, 21, 24, 27, 28, 36, 42, 48, 49, 54, 56, 63, 72, 81, 84, 98, 108, 112, 126, 144, 147, 162, 168, 189, 196, 216, 252, 294, 324, 336, 343, 378, 392, 432, 441, 504, 567, 588, 648, 686, 756, 784, 882, 1008, 1029, 1134, 1176, 1296, 1323, 1372, 1512, 1764, 2058, 2268, 2352, 2401, 2646, 2744, 3024, 3087, 3528, 3969, 4116, 4536, 4802, 5292, 5488, 6174, 7056, 7203, 7938, 8232, 9072, 9261, 9604, 10584, 12348, 14406, 15876, 16464, 16807, 18522, 19208, 21168, 21609, 24696, 27783, 28812, 31752, 33614, 37044, 38416, 43218, 49392, 50421, 55566, 57624, 63504, 64827, 67228, 74088, 86436, 100842, 111132, 115248, 129654, 134456, 148176, 151263, 172872, 194481, 201684, 222264, 259308, 268912, 302526, 345744, 388962, 403368, 444528, 453789, 518616, 605052, 777924, 806736, 907578, 1037232, 1210104, 1361367, 1555848, 1815156, 2420208, 2722734, 3111696, 3630312, 5445468, 7260624, 10890936, 21781872]

約数ペア:

[(1, 21781872), (2, 10890936), (3, 7260624), (4, 5445468), (6, 3630312), (7, 3111696), (8, 2722734), (9, 2420208), (12, 1815156), (14, 1555848), (16, 1361367), (18, 1210104), (21, 1037232), (24, 907578), (27, 806736), (28, 777924), (36, 605052), (42, 518616), (48, 453789), (49, 444528), (54, 403368), (56, 388962), (63, 345744), (72, 302526), (81, 268912), (84, 259308), (98, 222264), (108, 201684), (112, 194481), (126, 172872), (144, 151263), (147, 148176), (162, 134456), (168, 129654), (189, 115248), (196, 111132), (216, 100842), (252, 86436), (294, 74088), (324, 67228), (336, 64827), (343, 63504), (378, 57624), (392, 55566), (432, 50421), (441, 49392), (504, 43218), (567, 38416), (588, 37044), (648, 33614), (686, 31752), (756, 28812), (784, 27783), (882, 24696), (1008, 21609), (1029, 21168), (1134, 19208), (1176, 18522), (1296, 16807), (1323, 16464), (1372, 15876), (1512, 14406), (1764, 12348), (2058, 10584), (2268, 9604), (2352, 9261), (2401, 9072), (2646, 8232), (2744, 7938), (3024, 7203), (3087, 7056), (3528, 6174), (3969, 5488), (4116, 5292), (4536, 4802)]