20255638 has 8 divisors (see below), whose sum is σ = 32720688. Its totient is φ = 9348744.

The previous prime is 20255633. The next prime is 20255639. The reversal of 20255638 is 83655202.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20255633) 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, 389506 + ... + 389557.

It is an arithmetic number, because the mean of its divisors is an integer number (4090086).

Almost surely, 2^20255638 is an apocalyptic number.

20255638 is a deficient number, since it is larger than the sum of its proper divisors (12465050).

20255638 is a wasteful number, since it uses less digits than its factorization.

20255638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779078.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 20255638 is about 4500.6264008469. The cubic root of 20255638 is about 272.5933826909.

The spelling of 20255638 in words is "twenty million, two hundred fifty-five thousand, six hundred thirty-eight".