20398217

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{67}}^1$

素因数の和:189

約数の個数: 32

約数和(自身を含む): 25903104

約数和(自身を除く): 5504887

約数列:

[1, 7, 23, 31, 61, 67, 161, 217, 427, 469, 713, 1403, 1541, 1891, 2077, 4087, 4991, 9821, 10787, 13237, 14539, 28609, 43493, 47771, 94001, 126697, 304451, 334397, 658007, 886879, 2914031, 20398217]

約数ペア:

[(1, 20398217), (7, 2914031), (23, 886879), (31, 658007), (61, 334397), (67, 304451), (161, 126697), (217, 94001), (427, 47771), (469, 43493), (713, 28609), (1403, 14539), (1541, 13237), (1891, 10787), (2077, 9821), (4087, 4991)]