20320436 has 6 divisors (see below), whose sum is σ = 35560770. Its totient is φ = 10160216.

The previous prime is 20320427. The next prime is 20320439. The reversal of 20320436 is 63402302.

It can be written as a sum of positive squares in only one way, i.e., 10523536 + 9796900 = 3244^2 + 3130^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2540051 + ... + 2540058.

It is an arithmetic number, because the mean of its divisors is an integer number (5926795).

Almost surely, 2^20320436 is an apocalyptic number.

It is an amenable number.

20320436 is a deficient number, since it is larger than the sum of its proper divisors (15240334).

20320436 is a wasteful number, since it uses less digits than its factorization.

20320436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080113 (or 5080111 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 20320436 is about 4507.8194285042. The cubic root of 20320436 is about 272.8837496522.

Adding to 20320436 its reverse (63402302), we get a palindrome (83722738).

The spelling of 20320436 in words is "twenty million, three hundred twenty thousand, four hundred thirty-six".