20425638 has 8 divisors (see below), whose sum is σ = 40851288. Its totient is φ = 6808544.

The previous prime is 20425637. The next prime is 20425673. The reversal of 20425638 is 83652402.

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

20425638 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425637) 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, 1702131 + ... + 1702142.

It is an arithmetic number, because the mean of its divisors is an integer number (5106411).

Almost surely, 2^20425638 is an apocalyptic number.

20425638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20425638 is a wasteful number, since it uses less digits than its factorization.

20425638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3404278.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20425638 is about 4519.4731993895. The cubic root of 20425638 is about 273.3538595862.

The spelling of 20425638 in words is "twenty million, four hundred twenty-five thousand, six hundred thirty-eight".