20788115 has 4 divisors (see below), whose sum is σ = 24945744. Its totient is φ = 16630488.

The previous prime is 20788063. The next prime is 20788133. The reversal of 20788115 is 51188702.

It is a happy number.

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 20788115 - 2⁸ = 20787859 is a prime.

It is a Duffinian 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, 2078807 + ... + 2078816.

It is an arithmetic number, because the mean of its divisors is an integer number (6236436).

Almost surely, 2^20788115 is an apocalyptic number.

20788115 is a deficient number, since it is larger than the sum of its proper divisors (4157629).

20788115 is an equidigital number, since it uses as much as digits as its factorization.

20788115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157628.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 20788115 is about 4559.3985348947. The cubic root of 20788115 is about 274.9613830072.

The spelling of 20788115 in words is "twenty million, seven hundred eighty-eight thousand, one hundred fifteen".