21177560

素因数分解:

$2^3\times 5^1\times {\mathrm{499}}^1\times {\mathrm{1061}}^1$

素因数の和:1571

約数の個数: 32

約数和(自身を含む): 47790000

約数和(自身を除く): 26612440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 499, 998, 1061, 1996, 2122, 2495, 3992, 4244, 4990, 5305, 8488, 9980, 10610, 19960, 21220, 42440, 529439, 1058878, 2117756, 2647195, 4235512, 5294390, 10588780, 21177560]

約数ペア:

[(1, 21177560), (2, 10588780), (4, 5294390), (5, 4235512), (8, 2647195), (10, 2117756), (20, 1058878), (40, 529439), (499, 42440), (998, 21220), (1061, 19960), (1996, 10610), (2122, 9980), (2495, 8488), (3992, 5305), (4244, 4990)]