21395780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{67}}^1\times {\mathrm{2281}}^1$

素因数の和:2364

約数の個数: 48

約数和(自身を含む): 52139136

約数和(自身を除く): 30743356

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 67, 70, 134, 140, 268, 335, 469, 670, 938, 1340, 1876, 2281, 2345, 4562, 4690, 9124, 9380, 11405, 15967, 22810, 31934, 45620, 63868, 79835, 152827, 159670, 305654, 319340, 611308, 764135, 1069789, 1528270, 2139578, 3056540, 4279156, 5348945, 10697890, 21395780]

約数ペア:

[(1, 21395780), (2, 10697890), (4, 5348945), (5, 4279156), (7, 3056540), (10, 2139578), (14, 1528270), (20, 1069789), (28, 764135), (35, 611308), (67, 319340), (70, 305654), (134, 159670), (140, 152827), (268, 79835), (335, 63868), (469, 45620), (670, 31934), (938, 22810), (1340, 15967), (1876, 11405), (2281, 9380), (2345, 9124), (4562, 4690)]