20771928 has 24 divisors (see below), whose sum is σ = 56257500. Its totient is φ = 6923952.

The previous prime is 20771923. The next prime is 20771929. The reversal of 20771928 is 82917702.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20771892 and 20771901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20771923) 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 5 ways as a sum of consecutive naturals, for example, 144178 + ... + 144321.

Almost surely, 2^20771928 is an apocalyptic number.

It is an amenable number.

20771928 is an abundant number, since it is smaller than the sum of its proper divisors (35485572).

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

20771928 is a wasteful number, since it uses less digits than its factorization.

20771928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288511 (or 288504 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 20771928 is about 4557.6230647126. The cubic root of 20771928 is about 274.8899967746.

It can be divided in two parts, 2077 and 1928, that added together give a triangular number (4005 = T₈₉).

The spelling of 20771928 in words is "twenty million, seven hundred seventy-one thousand, nine hundred twenty-eight".