20087799 has 4 divisors (see below), whose sum is σ = 26783736. Its totient is φ = 13391864.

The previous prime is 20087797. The next prime is 20087813. The reversal of 20087799 is 99778002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20087799 - 2¹ = 20087797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20087799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20087791) 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, 3347964 + ... + 3347969.

It is an arithmetic number, because the mean of its divisors is an integer number (6695934).

Almost surely, 2^20087799 is an apocalyptic number.

20087799 is a deficient number, since it is larger than the sum of its proper divisors (6695937).

20087799 is an equidigital number, since it uses as much as digits as its factorization.

20087799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6695936.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 20087799 is about 4481.9414320136. The cubic root of 20087799 is about 271.8383870897.

The spelling of 20087799 in words is "twenty million, eighty-seven thousand, seven hundred ninety-nine".