21299120

素因数分解:

$2^4\times 5^1\times {\mathrm{266239}}^1$

素因数の和:266252

約数の個数: 20

約数和(自身を含む): 49520640

約数和(自身を除く): 28221520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266239, 532478, 1064956, 1331195, 2129912, 2662390, 4259824, 5324780, 10649560, 21299120]

約数ペア:

[(1, 21299120), (2, 10649560), (4, 5324780), (5, 4259824), (8, 2662390), (10, 2129912), (16, 1331195), (20, 1064956), (40, 532478), (80, 266239)]