20711828 has 12 divisors (see below), whose sum is σ = 36620052. Its totient is φ = 10248960.

The previous prime is 20711807. The next prime is 20711833. The reversal of 20711828 is 82811702.

It can be written as a sum of positive squares in 2 ways, for example, as 5750404 + 14961424 = 2398^2 + 3868^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20711828.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26303 + ... + 27078.

It is an arithmetic number, because the mean of its divisors is an integer number (3051671).

Almost surely, 2^20711828 is an apocalyptic number.

It is an amenable number.

20711828 is a deficient number, since it is larger than the sum of its proper divisors (15908224).

20711828 is a wasteful number, since it uses less digits than its factorization.

20711828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53482 (or 53480 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 20711828 is about 4551.0249395054. The cubic root of 20711828 is about 274.6246250364.

The spelling of 20711828 in words is "twenty million, seven hundred eleven thousand, eight hundred twenty-eight".