20203939 has 24 divisors (see below), whose sum is σ = 25307424. Its totient is φ = 15744000.

The previous prime is 20203933. The next prime is 20203949. The reversal of 20203939 is 93930202.

It is a happy number.

It is not a de Polignac number, because 20203939 - 2⁵ = 20203907 is a prime.

It is a super-2 number, since 2×20203939² = 816398302231442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20203933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199989 + ... + 200089.

It is an arithmetic number, because the mean of its divisors is an integer number (1054476).

Almost surely, 2^20203939 is an apocalyptic number.

20203939 is a deficient number, since it is larger than the sum of its proper divisors (5103485).

20203939 is a wasteful number, since it uses less digits than its factorization.

20203939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 20203939 is about 4494.8791974868. The cubic root of 20203939 is about 272.3612693383.

The spelling of 20203939 in words is "twenty million, two hundred three thousand, nine hundred thirty-nine".