20911772

素因数分解:

$2^2\times 7^1\times {\mathrm{67}}^1\times {\mathrm{71}}^1\times {\mathrm{157}}^1$

素因数の和:306

約数の個数: 48

約数和(自身を含む): 43319808

約数和(自身を除く): 22408036

約数列:

[1, 2, 4, 7, 14, 28, 67, 71, 134, 142, 157, 268, 284, 314, 469, 497, 628, 938, 994, 1099, 1876, 1988, 2198, 4396, 4757, 9514, 10519, 11147, 19028, 21038, 22294, 33299, 42076, 44588, 66598, 73633, 78029, 133196, 147266, 156058, 294532, 312116, 746849, 1493698, 2987396, 5227943, 10455886, 20911772]

約数ペア:

[(1, 20911772), (2, 10455886), (4, 5227943), (7, 2987396), (14, 1493698), (28, 746849), (67, 312116), (71, 294532), (134, 156058), (142, 147266), (157, 133196), (268, 78029), (284, 73633), (314, 66598), (469, 44588), (497, 42076), (628, 33299), (938, 22294), (994, 21038), (1099, 19028), (1876, 11147), (1988, 10519), (2198, 9514), (4396, 4757)]