20891990

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{1901}}^1$

素因数の和:2072

約数の個数: 32

約数和(自身を含む): 43274304

約数和(自身を除く): 22382314

約数列:

[1, 2, 5, 7, 10, 14, 35, 70, 157, 314, 785, 1099, 1570, 1901, 2198, 3802, 5495, 9505, 10990, 13307, 19010, 26614, 66535, 133070, 298457, 596914, 1492285, 2089199, 2984570, 4178398, 10445995, 20891990]

約数ペア:

[(1, 20891990), (2, 10445995), (5, 4178398), (7, 2984570), (10, 2089199), (14, 1492285), (35, 596914), (70, 298457), (157, 133070), (314, 66535), (785, 26614), (1099, 19010), (1570, 13307), (1901, 10990), (2198, 9505), (3802, 5495)]