19720456

素因数分解:

$2^3\times 7^1\times {\mathrm{157}}^1\times {\mathrm{2243}}^1$

素因数の和:2413

約数の個数: 32

約数和(自身を含む): 42546240

約数和(自身を除く): 22825784

約数列:

[1, 2, 4, 7, 8, 14, 28, 56, 157, 314, 628, 1099, 1256, 2198, 2243, 4396, 4486, 8792, 8972, 15701, 17944, 31402, 62804, 125608, 352151, 704302, 1408604, 2465057, 2817208, 4930114, 9860228, 19720456]

約数ペア:

[(1, 19720456), (2, 9860228), (4, 4930114), (7, 2817208), (8, 2465057), (14, 1408604), (28, 704302), (56, 352151), (157, 125608), (314, 62804), (628, 31402), (1099, 17944), (1256, 15701), (2198, 8972), (2243, 8792), (4396, 4486)]