20985399

素因数分解:

$3^4\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1$

素因数の和:213

約数の個数: 40

約数和(自身を含む): 32931360

約数和(自身を除く): 11945961

約数列:

[1, 3, 9, 27, 41, 71, 81, 89, 123, 213, 267, 369, 639, 801, 1107, 1917, 2403, 2911, 3321, 3649, 5751, 6319, 7209, 8733, 10947, 18957, 26199, 32841, 56871, 78597, 98523, 170613, 235791, 259079, 295569, 511839, 777237, 2331711, 6995133, 20985399]

約数ペア:

[(1, 20985399), (3, 6995133), (9, 2331711), (27, 777237), (41, 511839), (71, 295569), (81, 259079), (89, 235791), (123, 170613), (213, 98523), (267, 78597), (369, 56871), (639, 32841), (801, 26199), (1107, 18957), (1917, 10947), (2403, 8733), (2911, 7209), (3321, 6319), (3649, 5751)]