20257880

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^3$

素因数の和:121

約数の個数: 64

約数和(自身を含む): 49870080

約数和(自身を除く): 29612200

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 31, 34, 40, 62, 68, 85, 124, 136, 155, 170, 248, 310, 340, 527, 620, 680, 961, 1054, 1240, 1922, 2108, 2635, 3844, 4216, 4805, 5270, 7688, 9610, 10540, 16337, 19220, 21080, 29791, 32674, 38440, 59582, 65348, 81685, 119164, 130696, 148955, 163370, 238328, 297910, 326740, 506447, 595820, 653480, 1012894, 1191640, 2025788, 2532235, 4051576, 5064470, 10128940, 20257880]

約数ペア:

[(1, 20257880), (2, 10128940), (4, 5064470), (5, 4051576), (8, 2532235), (10, 2025788), (17, 1191640), (20, 1012894), (31, 653480), (34, 595820), (40, 506447), (62, 326740), (68, 297910), (85, 238328), (124, 163370), (136, 148955), (155, 130696), (170, 119164), (248, 81685), (310, 65348), (340, 59582), (527, 38440), (620, 32674), (680, 29791), (961, 21080), (1054, 19220), (1240, 16337), (1922, 10540), (2108, 9610), (2635, 7688), (3844, 5270), (4216, 4805)]