20199638 has 8 divisors (see below), whose sum is σ = 32081832. Its totient is φ = 9505696.

The previous prime is 20199623. The next prime is 20199643. The reversal of 20199638 is 83699102.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297020 + ... + 297087.

It is an arithmetic number, because the mean of its divisors is an integer number (4010229).

Almost surely, 2^20199638 is an apocalyptic number.

20199638 is a deficient number, since it is larger than the sum of its proper divisors (11882194).

20199638 is a wasteful number, since it uses less digits than its factorization.

20199638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594126.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 20199638 is about 4494.4007386970. The cubic root of 20199638 is about 272.3419412763.

The spelling of 20199638 in words is "twenty million, one hundred ninety-nine thousand, six hundred thirty-eight".