20991718

素因数分解:

$2^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1\times {\mathrm{151}}^1$

素因数の和:324

約数の個数: 32

約数和(自身を含む): 35458560

約数和(自身を除く): 14466842

約数列:

[1, 2, 11, 22, 71, 89, 142, 151, 178, 302, 781, 979, 1562, 1661, 1958, 3322, 6319, 10721, 12638, 13439, 21442, 26878, 69509, 117931, 139018, 147829, 235862, 295658, 954169, 1908338, 10495859, 20991718]

約数ペア:

[(1, 20991718), (2, 10495859), (11, 1908338), (22, 954169), (71, 295658), (89, 235862), (142, 147829), (151, 139018), (178, 117931), (302, 69509), (781, 26878), (979, 21442), (1562, 13439), (1661, 12638), (1958, 10721), (3322, 6319)]