19917755

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{313}}^1$

素因数の和:431

約数の個数: 32

約数和(自身を含む): 28486080

約数和(自身を除く): 8568325

約数列:

[1, 5, 11, 13, 55, 65, 89, 143, 313, 445, 715, 979, 1157, 1565, 3443, 4069, 4895, 5785, 12727, 17215, 20345, 27857, 44759, 63635, 139285, 223795, 306427, 362141, 1532135, 1810705, 3983551, 19917755]

約数ペア:

[(1, 19917755), (5, 3983551), (11, 1810705), (13, 1532135), (55, 362141), (65, 306427), (89, 223795), (143, 139285), (313, 63635), (445, 44759), (715, 27857), (979, 20345), (1157, 17215), (1565, 12727), (3443, 5785), (4069, 4895)]