21706191

素因数分解:

$3^3\times {\mathrm{13}}^2\times {\mathrm{67}}^1\times {\mathrm{71}}^1$

素因数の和:173

約数の個数: 48

約数和(自身を含む): 35838720

約数和(自身を除く): 14132529

約数列:

[1, 3, 9, 13, 27, 39, 67, 71, 117, 169, 201, 213, 351, 507, 603, 639, 871, 923, 1521, 1809, 1917, 2613, 2769, 4563, 4757, 7839, 8307, 11323, 11999, 14271, 23517, 24921, 33969, 35997, 42813, 61841, 101907, 107991, 128439, 185523, 305721, 323973, 556569, 803933, 1669707, 2411799, 7235397, 21706191]

約数ペア:

[(1, 21706191), (3, 7235397), (9, 2411799), (13, 1669707), (27, 803933), (39, 556569), (67, 323973), (71, 305721), (117, 185523), (169, 128439), (201, 107991), (213, 101907), (351, 61841), (507, 42813), (603, 35997), (639, 33969), (871, 24921), (923, 23517), (1521, 14271), (1809, 11999), (1917, 11323), (2613, 8307), (2769, 7839), (4563, 4757)]