20993799 has 8 divisors (see below), whose sum is σ = 28013040. Its totient is φ = 13985216.

The previous prime is 20993783. The next prime is 20993801. The reversal of 20993799 is 99739902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20993799 - 2⁴ = 20993783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5587 + ... + 8555.

It is an arithmetic number, because the mean of its divisors is an integer number (3501630).

Almost surely, 2^20993799 is an apocalyptic number.

20993799 is a deficient number, since it is larger than the sum of its proper divisors (7019241).

20993799 is a wasteful number, since it uses less digits than its factorization.

20993799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5329.

The product of its (nonzero) digits is 275562, while the sum is 48.

The square root of 20993799 is about 4581.8990604333. The cubic root of 20993799 is about 275.8652592682.

The spelling of 20993799 in words is "twenty million, nine hundred ninety-three thousand, seven hundred ninety-nine".