21781641

素因数分解:

$3^1\times 7^1\times {\mathrm{17}}^2\times {\mathrm{37}}^1\times {\mathrm{97}}^1$

素因数の和:178

約数の個数: 48

約数和(自身を含む): 36584576

約数和(自身を除く): 14802935

約数列:

[1, 3, 7, 17, 21, 37, 51, 97, 111, 119, 259, 289, 291, 357, 629, 679, 777, 867, 1649, 1887, 2023, 2037, 3589, 4403, 4947, 6069, 10693, 10767, 11543, 13209, 25123, 28033, 32079, 34629, 61013, 74851, 75369, 84099, 183039, 196231, 224553, 427091, 588693, 1037221, 1281273, 3111663, 7260547, 21781641]

約数ペア:

[(1, 21781641), (3, 7260547), (7, 3111663), (17, 1281273), (21, 1037221), (37, 588693), (51, 427091), (97, 224553), (111, 196231), (119, 183039), (259, 84099), (289, 75369), (291, 74851), (357, 61013), (629, 34629), (679, 32079), (777, 28033), (867, 25123), (1649, 13209), (1887, 11543), (2023, 10767), (2037, 10693), (3589, 6069), (4403, 4947)]