21135680

素因数分解:

$2^6\times 5^1\times {\mathrm{257}}^2$

素因数の和:531

約数の個数: 42

約数和(自身を含む): 50525934

約数和(自身を除く): 29390254

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 257, 320, 514, 1028, 1285, 2056, 2570, 4112, 5140, 8224, 10280, 16448, 20560, 41120, 66049, 82240, 132098, 264196, 330245, 528392, 660490, 1056784, 1320980, 2113568, 2641960, 4227136, 5283920, 10567840, 21135680]

約数ペア:

[(1, 21135680), (2, 10567840), (4, 5283920), (5, 4227136), (8, 2641960), (10, 2113568), (16, 1320980), (20, 1056784), (32, 660490), (40, 528392), (64, 330245), (80, 264196), (160, 132098), (257, 82240), (320, 66049), (514, 41120), (1028, 20560), (1285, 16448), (2056, 10280), (2570, 8224), (4112, 5140)]