18216965

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{67}}^1\times {\mathrm{89}}^1$

素因数の和:221

約数の個数: 32

約数和(自身を含む): 24675840

約数和(自身を除く): 6458875

約数列:

[1, 5, 13, 47, 65, 67, 89, 235, 335, 445, 611, 871, 1157, 3055, 3149, 4183, 4355, 5785, 5963, 15745, 20915, 29815, 40937, 54379, 77519, 204685, 271895, 280261, 387595, 1401305, 3643393, 18216965]

約数ペア:

[(1, 18216965), (5, 3643393), (13, 1401305), (47, 387595), (65, 280261), (67, 271895), (89, 204685), (235, 77519), (335, 54379), (445, 40937), (611, 29815), (871, 20915), (1157, 15745), (3055, 5963), (3149, 5785), (4183, 4355)]