20772816 has 40 divisors (see below), whose sum is σ = 55517280. Its totient is φ = 6685056.

The previous prime is 20772811. The next prime is 20772847. The reversal of 20772816 is 61827702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20772811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6070 + ... + 8853.

It is an arithmetic number, because the mean of its divisors is an integer number (1387932).

Almost surely, 2^20772816 is an apocalyptic number.

It is an amenable number.

20772816 is an abundant number, since it is smaller than the sum of its proper divisors (34744464).

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

20772816 is a wasteful number, since it uses less digits than its factorization.

20772816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14963 (or 14957 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 20772816 is about 4557.7204828730. The cubic root of 20772816 is about 274.8939139016.

The spelling of 20772816 in words is "twenty million, seven hundred seventy-two thousand, eight hundred sixteen".