20116638 has 12 divisors (see below), whose sum is σ = 43586088. Its totient is φ = 6705540.

The previous prime is 20116637. The next prime is 20116667. The reversal of 20116638 is 83661102.

20116638 is a `hidden beast` number, since 20 + 1 + 1 + 6 + 638 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20116637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 558778 + ... + 558813.

It is an arithmetic number, because the mean of its divisors is an integer number (3632174).

Almost surely, 2^20116638 is an apocalyptic number.

20116638 is an abundant number, since it is smaller than the sum of its proper divisors (23469450).

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

20116638 is a wasteful number, since it uses less digits than its factorization.

20116638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117599 (or 1117596 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20116638 is about 4485.1575223174. The cubic root of 20116638 is about 271.9684129265.

It can be divided in two parts, 2011 and 6638, that added together give a square (8649 = 93²).

The spelling of 20116638 in words is "twenty million, one hundred sixteen thousand, six hundred thirty-eight".