20772878 has 16 divisors (see below), whose sum is σ = 37705824. Its totient is φ = 8378880.

The previous prime is 20772877. The next prime is 20772901. The reversal of 20772878 is 87827702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20772877) 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, 43403 + ... + 43878.

It is an arithmetic number, because the mean of its divisors is an integer number (2356614).

Almost surely, 2^20772878 is an apocalyptic number.

20772878 is a deficient number, since it is larger than the sum of its proper divisors (16932946).

20772878 is a wasteful number, since it uses less digits than its factorization.

20772878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87307.

The product of its (nonzero) digits is 87808, while the sum is 41.

The square root of 20772878 is about 4557.7272845136. The cubic root of 20772878 is about 274.8941873905.

The spelling of 20772878 in words is "twenty million, seven hundred seventy-two thousand, eight hundred seventy-eight".