21290320

素因数分解:

$2^4\times 5^1\times {\mathrm{266129}}^1$

素因数の和:266142

約数の個数: 20

約数和(自身を含む): 49500180

約数和(自身を除く): 28209860

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266129, 532258, 1064516, 1330645, 2129032, 2661290, 4258064, 5322580, 10645160, 21290320]

約数ペア:

[(1, 21290320), (2, 10645160), (4, 5322580), (5, 4258064), (8, 2661290), (10, 2129032), (16, 1330645), (20, 1064516), (40, 532258), (80, 266129)]