20439072 has 36 divisors (see below), whose sum is σ = 58124430. Its totient is φ = 6812928.

The previous prime is 20439047. The next prime is 20439073. The reversal of 20439072 is 27093402.

20439072 is a `hidden beast` number, since 204 + 390 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20034576 + 404496 = 4476^2 + 636^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (20439073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35197 + ... + 35772.

Almost surely, 2^20439072 is an apocalyptic number.

It is an amenable number.

20439072 is an abundant number, since it is smaller than the sum of its proper divisors (37685358).

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

20439072 is a wasteful number, since it uses less digits than its factorization.

20439072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70985 (or 70974 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20439072 is about 4520.9591902604. The cubic root of 20439072 is about 273.4137749886.

The spelling of 20439072 in words is "twenty million, four hundred thirty-nine thousand, seventy-two".