19980275

素因数分解:

$5^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{127}}^1$

素因数の和:204

約数の個数: 48

約数和(自身を含む): 30474240

約数和(自身を除く): 10493965

約数列:

[1, 5, 7, 25, 29, 31, 35, 127, 145, 155, 175, 203, 217, 635, 725, 775, 889, 899, 1015, 1085, 3175, 3683, 3937, 4445, 4495, 5075, 5425, 6293, 18415, 19685, 22225, 22475, 25781, 27559, 31465, 92075, 98425, 114173, 128905, 137795, 157325, 570865, 644525, 688975, 799211, 2854325, 3996055, 19980275]

約数ペア:

[(1, 19980275), (5, 3996055), (7, 2854325), (25, 799211), (29, 688975), (31, 644525), (35, 570865), (127, 157325), (145, 137795), (155, 128905), (175, 114173), (203, 98425), (217, 92075), (635, 31465), (725, 27559), (775, 25781), (889, 22475), (899, 22225), (1015, 19685), (1085, 18415), (3175, 6293), (3683, 5425), (3937, 5075), (4445, 4495)]