20911984

素因数分解:

$2^4\times {\mathrm{641}}^1\times {\mathrm{2039}}^1$

素因数の和:2688

約数の個数: 20

約数和(自身を含む): 40600080

約数和(自身を除く): 19688096

約数列:

[1, 2, 4, 8, 16, 641, 1282, 2039, 2564, 4078, 5128, 8156, 10256, 16312, 32624, 1306999, 2613998, 5227996, 10455992, 20911984]

約数ペア:

[(1, 20911984), (2, 10455992), (4, 5227996), (8, 2613998), (16, 1306999), (641, 32624), (1282, 16312), (2039, 10256), (2564, 8156), (4078, 5128)]