21428240

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1\times {\mathrm{139}}^1$

素因数の和:240

約数の個数: 80

約数和(自身を含む): 52496640

約数和(自身を除く): 31068400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 47, 80, 82, 94, 139, 164, 188, 205, 235, 278, 328, 376, 410, 470, 556, 656, 695, 752, 820, 940, 1112, 1390, 1640, 1880, 1927, 2224, 2780, 3280, 3760, 3854, 5560, 5699, 6533, 7708, 9635, 11120, 11398, 13066, 15416, 19270, 22796, 26132, 28495, 30832, 32665, 38540, 45592, 52264, 56990, 65330, 77080, 91184, 104528, 113980, 130660, 154160, 227960, 261320, 267853, 455920, 522640, 535706, 1071412, 1339265, 2142824, 2678530, 4285648, 5357060, 10714120, 21428240]

約数ペア:

[(1, 21428240), (2, 10714120), (4, 5357060), (5, 4285648), (8, 2678530), (10, 2142824), (16, 1339265), (20, 1071412), (40, 535706), (41, 522640), (47, 455920), (80, 267853), (82, 261320), (94, 227960), (139, 154160), (164, 130660), (188, 113980), (205, 104528), (235, 91184), (278, 77080), (328, 65330), (376, 56990), (410, 52264), (470, 45592), (556, 38540), (656, 32665), (695, 30832), (752, 28495), (820, 26132), (940, 22796), (1112, 19270), (1390, 15416), (1640, 13066), (1880, 11398), (1927, 11120), (2224, 9635), (2780, 7708), (3280, 6533), (3760, 5699), (3854, 5560)]