20678534 has 4 divisors (see below), whose sum is σ = 31017804. Its totient is φ = 10339266.

The previous prime is 20678531. The next prime is 20678549. The reversal of 20678534 is 43587602.

It is a happy number.

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 = 20678494 and 20678503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5169632 + ... + 5169635.

It is an arithmetic number, because the mean of its divisors is an integer number (7754451).

Almost surely, 2^20678534 is an apocalyptic number.

20678534 is a deficient number, since it is larger than the sum of its proper divisors (10339270).

20678534 is a wasteful number, since it uses less digits than its factorization.

20678534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10339269.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20678534 is about 4547.3656109884. The cubic root of 20678534 is about 274.4773942541.

It can be divided in two parts, 20678 and 534, that added together give a palindrome (21212).

The spelling of 20678534 in words is "twenty million, six hundred seventy-eight thousand, five hundred thirty-four".