20939833 has 2 divisors, whose sum is σ = 20939834. Its totient is φ = 20939832.

The previous prime is 20939803. The next prime is 20939837. The reversal of 20939833 is 33893902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 2518569 = 4292^2 + 1587^2 .

It is a cyclic number.

It is not a de Polignac number, because 20939833 - 2¹⁷ = 20808761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20939792 and 20939801.

It is not a weakly prime, because it can be changed into another prime (20939837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10469916 + 10469917.

It is an arithmetic number, because the mean of its divisors is an integer number (10469917).

Almost surely, 2^20939833 is an apocalyptic number.

It is an amenable number.

20939833 is a deficient number, since it is larger than the sum of its proper divisors (1).

20939833 is an equidigital number, since it uses as much as digits as its factorization.

20939833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 20939833 is about 4576.0062281426. The cubic root of 20939833 is about 275.6286795820.

The spelling of 20939833 in words is "twenty million, nine hundred thirty-nine thousand, eight hundred thirty-three".