20638486 has 16 divisors (see below), whose sum is σ = 34055568. Its totient is φ = 9379920.

The previous prime is 20638483. The next prime is 20638507. The reversal of 20638486 is 68483602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20638483) 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, 1215 + ... + 6538.

It is an arithmetic number, because the mean of its divisors is an integer number (2128473).

Almost surely, 2^20638486 is an apocalyptic number.

20638486 is a deficient number, since it is larger than the sum of its proper divisors (13417082).

20638486 is an equidigital number, since it uses as much as digits as its factorization.

20638486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7788 (or 7766 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 20638486 is about 4542.9600482505. The cubic root of 20638486 is about 274.3000868016.

The spelling of 20638486 in words is "twenty million, six hundred thirty-eight thousand, four hundred eighty-six".