19900816

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{241}}^1\times {\mathrm{397}}^1$

素因数の和:659

約数の個数: 40

約数和(自身を含む): 41801144

約数和(自身を除く): 21900328

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 241, 397, 482, 794, 964, 1588, 1928, 3133, 3176, 3856, 5161, 6266, 6352, 10322, 12532, 20644, 25064, 41288, 50128, 82576, 95677, 191354, 382708, 765416, 1243801, 1530832, 2487602, 4975204, 9950408, 19900816]

約数ペア:

[(1, 19900816), (2, 9950408), (4, 4975204), (8, 2487602), (13, 1530832), (16, 1243801), (26, 765416), (52, 382708), (104, 191354), (208, 95677), (241, 82576), (397, 50128), (482, 41288), (794, 25064), (964, 20644), (1588, 12532), (1928, 10322), (3133, 6352), (3176, 6266), (3856, 5161)]