20682638 has 4 divisors (see below), whose sum is σ = 31023960. Its totient is φ = 10341318.

The previous prime is 20682637. The next prime is 20682653. The reversal of 20682638 is 83628602.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20682598 and 20682607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20682637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5170658 + ... + 5170661.

It is an arithmetic number, because the mean of its divisors is an integer number (7755990).

Almost surely, 2^20682638 is an apocalyptic number.

20682638 is a deficient number, since it is larger than the sum of its proper divisors (10341322).

20682638 is a wasteful number, since it uses less digits than its factorization.

20682638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10341321.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 20682638 is about 4547.8168388799. The cubic root of 20682638 is about 274.4955512587.

The spelling of 20682638 in words is "twenty million, six hundred eighty-two thousand, six hundred thirty-eight".