19937380

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{97}}^1\times {\mathrm{239}}^1$

素因数の和:388

約数の個数: 48

約数和(自身を含む): 43464960

約数和(自身を除く): 23527580

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 97, 172, 194, 215, 239, 388, 430, 478, 485, 860, 956, 970, 1195, 1940, 2390, 4171, 4780, 8342, 10277, 16684, 20554, 20855, 23183, 41108, 41710, 46366, 51385, 83420, 92732, 102770, 115915, 205540, 231830, 463660, 996869, 1993738, 3987476, 4984345, 9968690, 19937380]

約数ペア:

[(1, 19937380), (2, 9968690), (4, 4984345), (5, 3987476), (10, 1993738), (20, 996869), (43, 463660), (86, 231830), (97, 205540), (172, 115915), (194, 102770), (215, 92732), (239, 83420), (388, 51385), (430, 46366), (478, 41710), (485, 41108), (860, 23183), (956, 20855), (970, 20554), (1195, 16684), (1940, 10277), (2390, 8342), (4171, 4780)]