20439208 has 16 divisors (see below), whose sum is σ = 38376000. Its totient is φ = 10205616.

The previous prime is 20439191. The next prime is 20439257. The reversal of 20439208 is 80293402.

It is a super-2 number, since 2×20439208² = 835522447334528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7083 + ... + 9541.

It is an arithmetic number, because the mean of its divisors is an integer number (2398500).

Almost surely, 2^20439208 is an apocalyptic number.

It is an amenable number.

20439208 is a deficient number, since it is larger than the sum of its proper divisors (17936792).

20439208 is a wasteful number, since it uses less digits than its factorization.

20439208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3504 (or 3500 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20439208 is about 4520.9742312913. The cubic root of 20439208 is about 273.4143814120.

The spelling of 20439208 in words is "twenty million, four hundred thirty-nine thousand, two hundred eight".