20787728

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{719}}^1$

素因数の和:879

約数の個数: 40

約数和(自身を含む): 43747200

約数和(自身を除く): 22959472

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 139, 208, 278, 556, 719, 1112, 1438, 1807, 2224, 2876, 3614, 5752, 7228, 9347, 11504, 14456, 18694, 28912, 37388, 74776, 99941, 149552, 199882, 399764, 799528, 1299233, 1599056, 2598466, 5196932, 10393864, 20787728]

約数ペア:

[(1, 20787728), (2, 10393864), (4, 5196932), (8, 2598466), (13, 1599056), (16, 1299233), (26, 799528), (52, 399764), (104, 199882), (139, 149552), (208, 99941), (278, 74776), (556, 37388), (719, 28912), (1112, 18694), (1438, 14456), (1807, 11504), (2224, 9347), (2876, 7228), (3614, 5752)]