20639026 has 8 divisors (see below), whose sum is σ = 31483440. Its totient is φ = 10144548.

The previous prime is 20639023. The next prime is 20639057. The reversal of 20639026 is 62093602.

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 = 20638985 and 20639003.

It is not an unprimeable number, because it can be changed into a prime (20639023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87336 + ... + 87571.

It is an arithmetic number, because the mean of its divisors is an integer number (3935430).

Almost surely, 2^20639026 is an apocalyptic number.

20639026 is a deficient number, since it is larger than the sum of its proper divisors (10844414).

20639026 is a wasteful number, since it uses less digits than its factorization.

20639026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174968.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20639026 is about 4543.0194804777. The cubic root of 20639026 is about 274.3024791082.

The spelling of 20639026 in words is "twenty million, six hundred thirty-nine thousand, twenty-six".