21990716

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{59}}^1\times {\mathrm{197}}^1$

素因数の和:314

約数の個数: 48

約数和(自身を含む): 43908480

約数和(自身を除く): 21917764

約数列:

[1, 2, 4, 11, 22, 43, 44, 59, 86, 118, 172, 197, 236, 394, 473, 649, 788, 946, 1298, 1892, 2167, 2537, 2596, 4334, 5074, 8471, 8668, 10148, 11623, 16942, 23246, 27907, 33884, 46492, 55814, 93181, 111628, 127853, 186362, 255706, 372724, 499789, 511412, 999578, 1999156, 5497679, 10995358, 21990716]

約数ペア:

[(1, 21990716), (2, 10995358), (4, 5497679), (11, 1999156), (22, 999578), (43, 511412), (44, 499789), (59, 372724), (86, 255706), (118, 186362), (172, 127853), (197, 111628), (236, 93181), (394, 55814), (473, 46492), (649, 33884), (788, 27907), (946, 23246), (1298, 16942), (1892, 11623), (2167, 10148), (2537, 8668), (2596, 8471), (4334, 5074)]