638768080

素因数分解:

$2^4\times 5^1\times {\mathrm{7984601}}^1$

素因数の和:7984614

約数の個数: 20

約数和(自身を含む): 1485135972

約数和(自身を除く): 846367892

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 7984601, 15969202, 31938404, 39923005, 63876808, 79846010, 127753616, 159692020, 319384040, 638768080]

約数ペア:

[(1, 638768080), (2, 319384040), (4, 159692020), (5, 127753616), (8, 79846010), (10, 63876808), (16, 39923005), (20, 31938404), (40, 15969202), (80, 7984601)]