20439316 has 12 divisors (see below), whose sum is σ = 37002420. Its totient is φ = 9867200.

The previous prime is 20439299. The next prime is 20439317. The reversal of 20439316 is 61393402.

It can be written as a sum of positive squares in 2 ways, for example, as 7043716 + 13395600 = 2654^2 + 3660^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20439317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87985 + ... + 88216.

It is an arithmetic number, because the mean of its divisors is an integer number (3083535).

Almost surely, 2^20439316 is an apocalyptic number.

It is an amenable number.

20439316 is a deficient number, since it is larger than the sum of its proper divisors (16563104).

20439316 is a wasteful number, since it uses less digits than its factorization.

20439316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176234 (or 176232 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20439316 is about 4520.9861756037. The cubic root of 20439316 is about 273.4148629815.

The spelling of 20439316 in words is "twenty million, four hundred thirty-nine thousand, three hundred sixteen".