20420260

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{67}}^1\times {\mathrm{311}}^1$

素因数の和:401

約数の個数: 72

約数和(自身を含む): 50791104

約数和(自身を除く): 30370844

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 67, 70, 98, 134, 140, 196, 245, 268, 311, 335, 469, 490, 622, 670, 938, 980, 1244, 1340, 1555, 1876, 2177, 2345, 3110, 3283, 4354, 4690, 6220, 6566, 8708, 9380, 10885, 13132, 15239, 16415, 20837, 21770, 30478, 32830, 41674, 43540, 60956, 65660, 76195, 83348, 104185, 145859, 152390, 208370, 291718, 304780, 416740, 583436, 729295, 1021013, 1458590, 2042026, 2917180, 4084052, 5105065, 10210130, 20420260]

約数ペア:

[(1, 20420260), (2, 10210130), (4, 5105065), (5, 4084052), (7, 2917180), (10, 2042026), (14, 1458590), (20, 1021013), (28, 729295), (35, 583436), (49, 416740), (67, 304780), (70, 291718), (98, 208370), (134, 152390), (140, 145859), (196, 104185), (245, 83348), (268, 76195), (311, 65660), (335, 60956), (469, 43540), (490, 41674), (622, 32830), (670, 30478), (938, 21770), (980, 20837), (1244, 16415), (1340, 15239), (1555, 13132), (1876, 10885), (2177, 9380), (2345, 8708), (3110, 6566), (3283, 6220), (4354, 4690)]