20805640

素因数分解:

$2^3\times 5^1\times {\mathrm{157}}^1\times {\mathrm{3313}}^1$

素因数の和:3481

約数の個数: 32

約数和(自身を含む): 47125080

約数和(自身を除く): 26319440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 157, 314, 628, 785, 1256, 1570, 3140, 3313, 6280, 6626, 13252, 16565, 26504, 33130, 66260, 132520, 520141, 1040282, 2080564, 2600705, 4161128, 5201410, 10402820, 20805640]

約数ペア:

[(1, 20805640), (2, 10402820), (4, 5201410), (5, 4161128), (8, 2600705), (10, 2080564), (20, 1040282), (40, 520141), (157, 132520), (314, 66260), (628, 33130), (785, 26504), (1256, 16565), (1570, 13252), (3140, 6626), (3313, 6280)]