20439356 has 12 divisors (see below), whose sum is σ = 40878768. Its totient is φ = 8759712.

The previous prime is 20439347. The next prime is 20439379. The reversal of 20439356 is 65393402.

20439356 is an admirable number.

It is a congruent number.

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, 364961 + ... + 365016.

It is an arithmetic number, because the mean of its divisors is an integer number (3406564).

Almost surely, 2^20439356 is an apocalyptic number.

It is an amenable number.

20439356 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20439356 is a wasteful number, since it uses less digits than its factorization.

20439356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729988 (or 729986 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 20439356 is about 4520.9905994151. The cubic root of 20439356 is about 273.4150413402.

The spelling of 20439356 in words is "twenty million, four hundred thirty-nine thousand, three hundred fifty-six".