20675120

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2371}}^1$

素因数の和:2493

約数の個数: 40

約数和(自身を含む): 48531120

約数和(自身を除く): 27856000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 2371, 4360, 4742, 8720, 9484, 11855, 18968, 23710, 37936, 47420, 94840, 189680, 258439, 516878, 1033756, 1292195, 2067512, 2584390, 4135024, 5168780, 10337560, 20675120]

約数ペア:

[(1, 20675120), (2, 10337560), (4, 5168780), (5, 4135024), (8, 2584390), (10, 2067512), (16, 1292195), (20, 1033756), (40, 516878), (80, 258439), (109, 189680), (218, 94840), (436, 47420), (545, 37936), (872, 23710), (1090, 18968), (1744, 11855), (2180, 9484), (2371, 8720), (4360, 4742)]