20987408

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{107}}^1$

素因数の和:192

約数の個数: 80

約数和(自身を含む): 47246976

約数和(自身を除く): 26259568

約数列:

[1, 2, 4, 8, 13, 16, 23, 26, 41, 46, 52, 82, 92, 104, 107, 164, 184, 208, 214, 299, 328, 368, 428, 533, 598, 656, 856, 943, 1066, 1196, 1391, 1712, 1886, 2132, 2392, 2461, 2782, 3772, 4264, 4387, 4784, 4922, 5564, 7544, 8528, 8774, 9844, 11128, 12259, 15088, 17548, 19688, 22256, 24518, 31993, 35096, 39376, 49036, 57031, 63986, 70192, 98072, 100901, 114062, 127972, 196144, 201802, 228124, 255944, 403604, 456248, 511888, 807208, 912496, 1311713, 1614416, 2623426, 5246852, 10493704, 20987408]

約数ペア:

[(1, 20987408), (2, 10493704), (4, 5246852), (8, 2623426), (13, 1614416), (16, 1311713), (23, 912496), (26, 807208), (41, 511888), (46, 456248), (52, 403604), (82, 255944), (92, 228124), (104, 201802), (107, 196144), (164, 127972), (184, 114062), (208, 100901), (214, 98072), (299, 70192), (328, 63986), (368, 57031), (428, 49036), (533, 39376), (598, 35096), (656, 31993), (856, 24518), (943, 22256), (1066, 19688), (1196, 17548), (1391, 15088), (1712, 12259), (1886, 11128), (2132, 9844), (2392, 8774), (2461, 8528), (2782, 7544), (3772, 5564), (4264, 4922), (4387, 4784)]