20981947

素因数分解:

$7^2\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{727}}^1$

素因数の和:791

約数の個数: 24

約数和(自身を含む): 26557440

約数和(自身を除く): 5575493

約数列:

[1, 7, 19, 31, 49, 133, 217, 589, 727, 931, 1519, 4123, 5089, 13813, 22537, 28861, 35623, 96691, 157759, 428203, 676837, 1104313, 2997421, 20981947]

約数ペア:

[(1, 20981947), (7, 2997421), (19, 1104313), (31, 676837), (49, 428203), (133, 157759), (217, 96691), (589, 35623), (727, 28861), (931, 22537), (1519, 13813), (4123, 5089)]