20781656

素因数分解:

$2^3\times 7^1\times {\mathrm{31}}^1\times {\mathrm{11971}}^1$

素因数の和:12015

約数の個数: 32

約数和(自身を含む): 45972480

約数和(自身を除く): 25190824

約数列:

[1, 2, 4, 7, 8, 14, 28, 31, 56, 62, 124, 217, 248, 434, 868, 1736, 11971, 23942, 47884, 83797, 95768, 167594, 335188, 371101, 670376, 742202, 1484404, 2597707, 2968808, 5195414, 10390828, 20781656]

約数ペア:

[(1, 20781656), (2, 10390828), (4, 5195414), (7, 2968808), (8, 2597707), (14, 1484404), (28, 742202), (31, 670376), (56, 371101), (62, 335188), (124, 167594), (217, 95768), (248, 83797), (434, 47884), (868, 23942), (1736, 11971)]