20764216 has 32 divisors (see below), whose sum is σ = 44323200. Its totient is φ = 9027040.

The previous prime is 20764213. The next prime is 20764223. The reversal of 20764216 is 61246702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20764213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3106 + ... + 7153.

It is an arithmetic number, because the mean of its divisors is an integer number (1385100).

Almost surely, 2^20764216 is an apocalyptic number.

It is an amenable number.

20764216 is an abundant number, since it is smaller than the sum of its proper divisors (23558984).

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

20764216 is a wasteful number, since it uses less digits than its factorization.

20764216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10299 (or 10295 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20764216 is about 4556.7769311214. The cubic root of 20764216 is about 274.8559730662.

The spelling of 20764216 in words is "twenty million, seven hundred sixty-four thousand, two hundred sixteen".