21180272

素因数分解:

$2^4\times {\mathrm{41}}^1\times {\mathrm{83}}^1\times {\mathrm{389}}^1$

素因数の和:521

約数の個数: 40

約数和(自身を含む): 42653520

約数和(自身を除く): 21473248

約数列:

[1, 2, 4, 8, 16, 41, 82, 83, 164, 166, 328, 332, 389, 656, 664, 778, 1328, 1556, 3112, 3403, 6224, 6806, 13612, 15949, 27224, 31898, 32287, 54448, 63796, 64574, 127592, 129148, 255184, 258296, 516592, 1323767, 2647534, 5295068, 10590136, 21180272]

約数ペア:

[(1, 21180272), (2, 10590136), (4, 5295068), (8, 2647534), (16, 1323767), (41, 516592), (82, 258296), (83, 255184), (164, 129148), (166, 127592), (328, 64574), (332, 63796), (389, 54448), (656, 32287), (664, 31898), (778, 27224), (1328, 15949), (1556, 13612), (3112, 6806), (3403, 6224)]