20638712 has 16 divisors (see below), whose sum is σ = 40734600. Its totient is φ = 9776160.

The previous prime is 20638699. The next prime is 20638729. The reversal of 20638712 is 21783602.

It is a happy number.

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, 67739 + ... + 68042.

Almost surely, 2^20638712 is an apocalyptic number.

It is an amenable number.

20638712 is a deficient number, since it is larger than the sum of its proper divisors (20095888).

20638712 is a wasteful number, since it uses less digits than its factorization.

20638712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135806 (or 135802 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20638712 is about 4542.9849218328. The cubic root of 20638712 is about 274.3010880313.

The spelling of 20638712 in words is "twenty million, six hundred thirty-eight thousand, seven hundred twelve".