20204638 has 8 divisors (see below), whose sum is σ = 31902120. Its totient is φ = 9570600.

The previous prime is 20204633. The next prime is 20204641. The reversal of 20204638 is 83640202.

It is a happy number.

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

It is a super-2 number, since 2×20204638² = 816454793422088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20204633) 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, 265813 + ... + 265888.

It is an arithmetic number, because the mean of its divisors is an integer number (3987765).

Almost surely, 2^20204638 is an apocalyptic number.

20204638 is a deficient number, since it is larger than the sum of its proper divisors (11697482).

20204638 is a wasteful number, since it uses less digits than its factorization.

20204638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531722.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20204638 is about 4494.9569519629. The cubic root of 20204638 is about 272.3644102824.

The spelling of 20204638 in words is "twenty million, two hundred four thousand, six hundred thirty-eight".