20778381

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{719}}^1$

素因数の和:770

約数の個数: 36

約数和(自身を含む): 34257600

約数和(自身を除く): 13479219

約数列:

[1, 3, 9, 13, 19, 39, 57, 117, 169, 171, 247, 507, 719, 741, 1521, 2157, 2223, 3211, 6471, 9347, 9633, 13661, 28041, 28899, 40983, 84123, 121511, 122949, 177593, 364533, 532779, 1093599, 1598337, 2308709, 6926127, 20778381]

約数ペア:

[(1, 20778381), (3, 6926127), (9, 2308709), (13, 1598337), (19, 1093599), (39, 532779), (57, 364533), (117, 177593), (169, 122949), (171, 121511), (247, 84123), (507, 40983), (719, 28899), (741, 28041), (1521, 13661), (2157, 9633), (2223, 9347), (3211, 6471)]