20997305

素因数分解:

$5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{137}}^1\times {\mathrm{151}}^1$

素因数の和:329

約数の個数: 32

約数和(自身を含む): 30205440

約数和(自身を除く): 9208135

約数列:

[1, 5, 7, 29, 35, 137, 145, 151, 203, 685, 755, 959, 1015, 1057, 3973, 4379, 4795, 5285, 19865, 20687, 21895, 27811, 30653, 103435, 139055, 144809, 153265, 599923, 724045, 2999615, 4199461, 20997305]

約数ペア:

[(1, 20997305), (5, 4199461), (7, 2999615), (29, 724045), (35, 599923), (137, 153265), (145, 144809), (151, 139055), (203, 103435), (685, 30653), (755, 27811), (959, 21895), (1015, 20687), (1057, 19865), (3973, 5285), (4379, 4795)]