20748021

素因数分解:

$3^1\times 7^2\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{157}}^1$

素因数の和:234

約数の個数: 48

約数和(自身を含む): 34583040

約数和(自身を除く): 13835019

約数列:

[1, 3, 7, 21, 29, 31, 49, 87, 93, 147, 157, 203, 217, 471, 609, 651, 899, 1099, 1421, 1519, 2697, 3297, 4263, 4553, 4557, 4867, 6293, 7693, 13659, 14601, 18879, 23079, 31871, 34069, 44051, 95613, 102207, 132153, 141143, 223097, 238483, 423429, 669291, 715449, 988001, 2964003, 6916007, 20748021]

約数ペア:

[(1, 20748021), (3, 6916007), (7, 2964003), (21, 988001), (29, 715449), (31, 669291), (49, 423429), (87, 238483), (93, 223097), (147, 141143), (157, 132153), (203, 102207), (217, 95613), (471, 44051), (609, 34069), (651, 31871), (899, 23079), (1099, 18879), (1421, 14601), (1519, 13659), (2697, 7693), (3297, 6293), (4263, 4867), (4553, 4557)]