21388460

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{13537}}^1$

素因数の和:13625

約数の個数: 24

約数和(自身を含む): 45487680

約数和(自身を除く): 24099220

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 13537, 27074, 54148, 67685, 135370, 270740, 1069423, 2138846, 4277692, 5347115, 10694230, 21388460]

約数ペア:

[(1, 21388460), (2, 10694230), (4, 5347115), (5, 4277692), (10, 2138846), (20, 1069423), (79, 270740), (158, 135370), (316, 67685), (395, 54148), (790, 27074), (1580, 13537)]