20712228 has 24 divisors (see below), whose sum is σ = 48437760. Its totient is φ = 6888480.

The previous prime is 20712227. The next prime is 20712253. The reversal of 20712228 is 82221702.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20712198 and 20712207.

It is not an unprimeable number, because it can be changed into a prime (20712221) 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, 4413 + ... + 7803.

It is an arithmetic number, because the mean of its divisors is an integer number (2018240).

Almost surely, 2^20712228 is an apocalyptic number.

It is an amenable number.

20712228 is an abundant number, since it is smaller than the sum of its proper divisors (27725532).

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

20712228 is a wasteful number, since it uses less digits than its factorization.

20712228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3907 (or 3905 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20712228 is about 4551.0688854378. The cubic root of 20712228 is about 274.6263929336.

The spelling of 20712228 in words is "twenty million, seven hundred twelve thousand, two hundred twenty-eight".