18979760

素因数分解:

$2^4\times 5^1\times {\mathrm{67}}^1\times {\mathrm{3541}}^1$

素因数の和:3621

約数の個数: 40

約数和(自身を含む): 44799216

約数和(自身を除く): 25819456

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 67, 80, 134, 268, 335, 536, 670, 1072, 1340, 2680, 3541, 5360, 7082, 14164, 17705, 28328, 35410, 56656, 70820, 141640, 237247, 283280, 474494, 948988, 1186235, 1897976, 2372470, 3795952, 4744940, 9489880, 18979760]

約数ペア:

[(1, 18979760), (2, 9489880), (4, 4744940), (5, 3795952), (8, 2372470), (10, 1897976), (16, 1186235), (20, 948988), (40, 474494), (67, 283280), (80, 237247), (134, 141640), (268, 70820), (335, 56656), (536, 35410), (670, 28328), (1072, 17705), (1340, 14164), (2680, 7082), (3541, 5360)]