20712828 has 24 divisors (see below), whose sum is σ = 48521088. Its totient is φ = 6876976.

The previous prime is 20712823. The next prime is 20712829. The reversal of 20712828 is 82821702.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20712795 and 20712804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712823) 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, 126 + ... + 6437.

It is an arithmetic number, because the mean of its divisors is an integer number (2021712).

Almost surely, 2^20712828 is an apocalyptic number.

It is an amenable number.

20712828 is an abundant number, since it is smaller than the sum of its proper divisors (27808260).

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

20712828 is a wasteful number, since it uses less digits than its factorization.

20712828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6833 (or 6831 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 20712828 is about 4551.1348035408. The cubic root of 20712828 is about 274.6290447366.

The spelling of 20712828 in words is "twenty million, seven hundred twelve thousand, eight hundred twenty-eight".