20688745

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{109}}^1$

素因数の和:178

約数の個数: 64

約数和(自身を含む): 34214400

約数和(自身を除く): 13525655

約数列:

[1, 5, 7, 11, 17, 29, 35, 55, 77, 85, 109, 119, 145, 187, 203, 319, 385, 493, 545, 595, 763, 935, 1015, 1199, 1309, 1595, 1853, 2233, 2465, 3161, 3451, 3815, 5423, 5995, 6545, 8393, 9265, 11165, 12971, 15805, 17255, 20383, 22127, 27115, 34771, 37961, 41965, 53737, 64855, 101915, 110635, 142681, 173855, 189805, 243397, 268685, 376159, 591107, 713405, 1216985, 1880795, 2955535, 4137749, 20688745]

約数ペア:

[(1, 20688745), (5, 4137749), (7, 2955535), (11, 1880795), (17, 1216985), (29, 713405), (35, 591107), (55, 376159), (77, 268685), (85, 243397), (109, 189805), (119, 173855), (145, 142681), (187, 110635), (203, 101915), (319, 64855), (385, 53737), (493, 41965), (545, 37961), (595, 34771), (763, 27115), (935, 22127), (1015, 20383), (1199, 17255), (1309, 15805), (1595, 12971), (1853, 11165), (2233, 9265), (2465, 8393), (3161, 6545), (3451, 5995), (3815, 5423)]