21756400

素因数分解:

$2^4\times 5^2\times {\mathrm{109}}^1\times {\mathrm{499}}^1$

素因数の和:626

約数の個数: 60

約数和(自身を含む): 52855000

約数和(自身を除く): 31098600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 109, 200, 218, 400, 436, 499, 545, 872, 998, 1090, 1744, 1996, 2180, 2495, 2725, 3992, 4360, 4990, 5450, 7984, 8720, 9980, 10900, 12475, 19960, 21800, 24950, 39920, 43600, 49900, 54391, 99800, 108782, 199600, 217564, 271955, 435128, 543910, 870256, 1087820, 1359775, 2175640, 2719550, 4351280, 5439100, 10878200, 21756400]

約数ペア:

[(1, 21756400), (2, 10878200), (4, 5439100), (5, 4351280), (8, 2719550), (10, 2175640), (16, 1359775), (20, 1087820), (25, 870256), (40, 543910), (50, 435128), (80, 271955), (100, 217564), (109, 199600), (200, 108782), (218, 99800), (400, 54391), (436, 49900), (499, 43600), (545, 39920), (872, 24950), (998, 21800), (1090, 19960), (1744, 12475), (1996, 10900), (2180, 9980), (2495, 8720), (2725, 7984), (3992, 5450), (4360, 4990)]