20517712 has 20 divisors (see below), whose sum is σ = 40723956. Its totient is φ = 10008320.

The previous prime is 20517677. The next prime is 20517719. The reversal of 20517712 is 21771502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5494336 + 15023376 = 2344^2 + 3876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20517719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14983 + ... + 16294.

Almost surely, 2^20517712 is an apocalyptic number.

It is an amenable number.

20517712 is a deficient number, since it is larger than the sum of its proper divisors (20206244).

20517712 is a wasteful number, since it uses less digits than its factorization.

20517712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31326 (or 31320 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 20517712 is about 4529.6481099529. The cubic root of 20517712 is about 273.7639823832.

The spelling of 20517712 in words is "twenty million, five hundred seventeen thousand, seven hundred twelve".