20681871

素因数分解:

$3^1\times 7^3\times {\mathrm{101}}^1\times {\mathrm{199}}^1$

素因数の和:324

約数の個数: 32

約数和(自身を含む): 32640000

約数和(自身を除く): 11958129

約数列:

[1, 3, 7, 21, 49, 101, 147, 199, 303, 343, 597, 707, 1029, 1393, 2121, 4179, 4949, 9751, 14847, 20099, 29253, 34643, 60297, 68257, 103929, 140693, 204771, 422079, 984851, 2954553, 6893957, 20681871]

約数ペア:

[(1, 20681871), (3, 6893957), (7, 2954553), (21, 984851), (49, 422079), (101, 204771), (147, 140693), (199, 103929), (303, 68257), (343, 60297), (597, 34643), (707, 29253), (1029, 20099), (1393, 14847), (2121, 9751), (4179, 4949)]