21008421

素因数分解:

$3^2\times 7^1\times {\mathrm{31}}^2\times {\mathrm{347}}^1$

素因数の和:422

約数の個数: 36

約数和(自身を含む): 35938656

約数和(自身を除く): 14930235

約数列:

[1, 3, 7, 9, 21, 31, 63, 93, 217, 279, 347, 651, 961, 1041, 1953, 2429, 2883, 3123, 6727, 7287, 8649, 10757, 20181, 21861, 32271, 60543, 75299, 96813, 225897, 333467, 677691, 1000401, 2334269, 3001203, 7002807, 21008421]

約数ペア:

[(1, 21008421), (3, 7002807), (7, 3001203), (9, 2334269), (21, 1000401), (31, 677691), (63, 333467), (93, 225897), (217, 96813), (279, 75299), (347, 60543), (651, 32271), (961, 21861), (1041, 20181), (1953, 10757), (2429, 8649), (2883, 7287), (3123, 6727)]