21709989

素因数分解:

$3^2\times 7^2\times {\mathrm{19}}^1\times {\mathrm{2591}}^1$

素因数の和:2630

約数の個数: 36

約数和(自身を含む): 38413440

約数和(自身を除く): 16703451

約数列:

[1, 3, 7, 9, 19, 21, 49, 57, 63, 133, 147, 171, 399, 441, 931, 1197, 2591, 2793, 7773, 8379, 18137, 23319, 49229, 54411, 126959, 147687, 163233, 344603, 380877, 443061, 1033809, 1142631, 2412221, 3101427, 7236663, 21709989]

約数ペア:

[(1, 21709989), (3, 7236663), (7, 3101427), (9, 2412221), (19, 1142631), (21, 1033809), (49, 443061), (57, 380877), (63, 344603), (133, 163233), (147, 147687), (171, 126959), (399, 54411), (441, 49229), (931, 23319), (1197, 18137), (2591, 8379), (2793, 7773)]