20638426 has 4 divisors (see below), whose sum is σ = 30957642. Its totient is φ = 10319212.

The previous prime is 20638421. The next prime is 20638451. The reversal of 20638426 is 62483602.

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

It can be written as a sum of positive squares in only one way, i.e., 18533025 + 2105401 = 4305^2 + 1451^2 .

It is not an unprimeable number, because it can be changed into a prime (20638421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5159605 + ... + 5159608.

Almost surely, 2^20638426 is an apocalyptic number.

20638426 is a deficient number, since it is larger than the sum of its proper divisors (10319216).

20638426 is a wasteful number, since it uses less digits than its factorization.

20638426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10319215.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 20638426 is about 4542.9534446217. The cubic root of 20638426 is about 274.2998209872.

The spelling of 20638426 in words is "twenty million, six hundred thirty-eight thousand, four hundred twenty-six".