21390280

素因数分解:

$2^3\times 5^1\times {\mathrm{587}}^1\times {\mathrm{911}}^1$

素因数の和:1509

約数の個数: 32

約数和(自身を含む): 48263040

約数和(自身を除く): 26872760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 587, 911, 1174, 1822, 2348, 2935, 3644, 4555, 4696, 5870, 7288, 9110, 11740, 18220, 23480, 36440, 534757, 1069514, 2139028, 2673785, 4278056, 5347570, 10695140, 21390280]

約数ペア:

[(1, 21390280), (2, 10695140), (4, 5347570), (5, 4278056), (8, 2673785), (10, 2139028), (20, 1069514), (40, 534757), (587, 36440), (911, 23480), (1174, 18220), (1822, 11740), (2348, 9110), (2935, 7288), (3644, 5870), (4555, 4696)]