20538634 has 8 divisors (see below), whose sum is σ = 30831840. Its totient is φ = 10261356.

The previous prime is 20538631. The next prime is 20538643. The reversal of 20538634 is 43683502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20538596 and 20538605.

It is not an unprimeable number, because it can be changed into a prime (20538631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (3853980).

Almost surely, 2^20538634 is an apocalyptic number.

20538634 is a deficient number, since it is larger than the sum of its proper divisors (10293206).

20538634 is a wasteful number, since it uses less digits than its factorization.

20538634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7964.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20538634 is about 4531.9569724348. The cubic root of 20538634 is about 273.8570035461.

The spelling of 20538634 in words is "twenty million, five hundred thirty-eight thousand, six hundred thirty-four".