20488640

素因数分解:

$2^6\times 5^1\times {\mathrm{43}}^1\times {\mathrm{1489}}^1$

素因数の和:1549

約数の個数: 56

約数和(自身を含む): 49956720

約数和(自身を除く): 29468080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 43, 64, 80, 86, 160, 172, 215, 320, 344, 430, 688, 860, 1376, 1489, 1720, 2752, 2978, 3440, 5956, 6880, 7445, 11912, 13760, 14890, 23824, 29780, 47648, 59560, 64027, 95296, 119120, 128054, 238240, 256108, 320135, 476480, 512216, 640270, 1024432, 1280540, 2048864, 2561080, 4097728, 5122160, 10244320, 20488640]

約数ペア:

[(1, 20488640), (2, 10244320), (4, 5122160), (5, 4097728), (8, 2561080), (10, 2048864), (16, 1280540), (20, 1024432), (32, 640270), (40, 512216), (43, 476480), (64, 320135), (80, 256108), (86, 238240), (160, 128054), (172, 119120), (215, 95296), (320, 64027), (344, 59560), (430, 47648), (688, 29780), (860, 23824), (1376, 14890), (1489, 13760), (1720, 11912), (2752, 7445), (2978, 6880), (3440, 5956)]