20691788

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{263}}^1$

素因数の和:386

約数の個数: 48

約数和(自身を含む): 41912640

約数和(自身を除く): 21220852

約数列:

[1, 2, 4, 13, 17, 26, 34, 52, 68, 89, 178, 221, 263, 356, 442, 526, 884, 1052, 1157, 1513, 2314, 3026, 3419, 4471, 4628, 6052, 6838, 8942, 13676, 17884, 19669, 23407, 39338, 46814, 58123, 78676, 93628, 116246, 232492, 304291, 397919, 608582, 795838, 1217164, 1591676, 5172947, 10345894, 20691788]

約数ペア:

[(1, 20691788), (2, 10345894), (4, 5172947), (13, 1591676), (17, 1217164), (26, 795838), (34, 608582), (52, 397919), (68, 304291), (89, 232492), (178, 116246), (221, 93628), (263, 78676), (356, 58123), (442, 46814), (526, 39338), (884, 23407), (1052, 19669), (1157, 17884), (1513, 13676), (2314, 8942), (3026, 6838), (3419, 6052), (4471, 4628)]