21280028

素因数分解:

$2^2\times 7^1\times {\mathrm{11}}^3\times {\mathrm{571}}^1$

素因数の和:615

約数の個数: 48

約数和(自身を含む): 46894848

約数和(自身を除く): 25614820

約数列:

[1, 2, 4, 7, 11, 14, 22, 28, 44, 77, 121, 154, 242, 308, 484, 571, 847, 1142, 1331, 1694, 2284, 2662, 3388, 3997, 5324, 6281, 7994, 9317, 12562, 15988, 18634, 25124, 37268, 43967, 69091, 87934, 138182, 175868, 276364, 483637, 760001, 967274, 1520002, 1934548, 3040004, 5320007, 10640014, 21280028]

約数ペア:

[(1, 21280028), (2, 10640014), (4, 5320007), (7, 3040004), (11, 1934548), (14, 1520002), (22, 967274), (28, 760001), (44, 483637), (77, 276364), (121, 175868), (154, 138182), (242, 87934), (308, 69091), (484, 43967), (571, 37268), (847, 25124), (1142, 18634), (1331, 15988), (1694, 12562), (2284, 9317), (2662, 7994), (3388, 6281), (3997, 5324)]