20551707115 has 4 divisors (see below), whose sum is σ = 24662048544. Its totient is φ = 16441365688.

The previous prime is 20551707047. The next prime is 20551707119. The reversal of 20551707115 is 51170715502.

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 20551707115 - 2²¹ = 20549609963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20551707119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2055170707 + ... + 2055170716.

It is an arithmetic number, because the mean of its divisors is an integer number (6165512136).

Almost surely, 2^20551707115 is an apocalyptic number.

20551707115 is a deficient number, since it is larger than the sum of its proper divisors (4110341429).

20551707115 is an equidigital number, since it uses as much as digits as its factorization.

20551707115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110341428.

The product of its (nonzero) digits is 12250, while the sum is 34.

The spelling of 20551707115 in words is "twenty billion, five hundred fifty-one million, seven hundred seven thousand, one hundred fifteen".