19997684

素因数分解:

$2^2\times 7^2\times {\mathrm{257}}^1\times {\mathrm{397}}^1$

素因数の和:672

約数の個数: 36

約数和(自身を含む): 40970916

約数和(自身を除く): 20973232

約数列:

[1, 2, 4, 7, 14, 28, 49, 98, 196, 257, 397, 514, 794, 1028, 1588, 1799, 2779, 3598, 5558, 7196, 11116, 12593, 19453, 25186, 38906, 50372, 77812, 102029, 204058, 408116, 714203, 1428406, 2856812, 4999421, 9998842, 19997684]

約数ペア:

[(1, 19997684), (2, 9998842), (4, 4999421), (7, 2856812), (14, 1428406), (28, 714203), (49, 408116), (98, 204058), (196, 102029), (257, 77812), (397, 50372), (514, 38906), (794, 25186), (1028, 19453), (1588, 12593), (1799, 11116), (2779, 7196), (3598, 5558)]