20528920

素因数分解:

$2^3\times 5^1\times {\mathrm{317}}^1\times {\mathrm{1619}}^1$

素因数の和:1947

約数の個数: 32

約数和(自身を含む): 46364400

約数和(自身を除く): 25835480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 317, 634, 1268, 1585, 1619, 2536, 3170, 3238, 6340, 6476, 8095, 12680, 12952, 16190, 32380, 64760, 513223, 1026446, 2052892, 2566115, 4105784, 5132230, 10264460, 20528920]

約数ペア:

[(1, 20528920), (2, 10264460), (4, 5132230), (5, 4105784), (8, 2566115), (10, 2052892), (20, 1026446), (40, 513223), (317, 64760), (634, 32380), (1268, 16190), (1585, 12952), (1619, 12680), (2536, 8095), (3170, 6476), (3238, 6340)]