20533939 has 2 divisors, whose sum is σ = 20533940. Its totient is φ = 20533938.

The previous prime is 20533897. The next prime is 20533957. The reversal of 20533939 is 93933502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20533939 - 2⁹ = 20533427 is a prime.

It is not a weakly prime, because it can be changed into another prime (20533979) 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, 10266969 + 10266970.

It is an arithmetic number, because the mean of its divisors is an integer number (10266970).

Almost surely, 2^20533939 is an apocalyptic number.

20533939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20533939 is an equidigital number, since it uses as much as digits as its factorization.

20533939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 34.

The square root of 20533939 is about 4531.4389546810. The cubic root of 20533939 is about 273.8361346377.

The spelling of 20533939 in words is "twenty million, five hundred thirty-three thousand, nine hundred thirty-nine".