21891580

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^2\times {\mathrm{67}}^1$

素因数の和:155

約数の個数: 72

約数和(自身を含む): 51048144

約数和(自身を除く): 29156564

約数列:

[1, 2, 4, 5, 10, 17, 20, 31, 34, 62, 67, 68, 85, 124, 134, 155, 170, 268, 310, 335, 340, 527, 620, 670, 961, 1054, 1139, 1340, 1922, 2077, 2108, 2278, 2635, 3844, 4154, 4556, 4805, 5270, 5695, 8308, 9610, 10385, 10540, 11390, 16337, 19220, 20770, 22780, 32674, 35309, 41540, 64387, 65348, 70618, 81685, 128774, 141236, 163370, 176545, 257548, 321935, 326740, 353090, 643870, 706180, 1094579, 1287740, 2189158, 4378316, 5472895, 10945790, 21891580]

約数ペア:

[(1, 21891580), (2, 10945790), (4, 5472895), (5, 4378316), (10, 2189158), (17, 1287740), (20, 1094579), (31, 706180), (34, 643870), (62, 353090), (67, 326740), (68, 321935), (85, 257548), (124, 176545), (134, 163370), (155, 141236), (170, 128774), (268, 81685), (310, 70618), (335, 65348), (340, 64387), (527, 41540), (620, 35309), (670, 32674), (961, 22780), (1054, 20770), (1139, 19220), (1340, 16337), (1922, 11390), (2077, 10540), (2108, 10385), (2278, 9610), (2635, 8308), (3844, 5695), (4154, 5270), (4556, 4805)]