20218375087 has 4 divisors (see below), whose sum is σ = 20244944016. Its totient is φ = 20191806160.

The previous prime is 20218374991. The next prime is 20218375091. The reversal of 20218375087 is 78057381202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78057381202 = 2 ⋅39028690601.

It is a cyclic number.

It is not a de Polignac number, because 20218375087 - 2¹¹ = 20218373039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218315087) 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, 13283323 + ... + 13284844.

It is an arithmetic number, because the mean of its divisors is an integer number (5061236004).

Almost surely, 2^20218375087 is an apocalyptic number.

20218375087 is a deficient number, since it is larger than the sum of its proper divisors (26568929).

20218375087 is an equidigital number, since it uses as much as digits as its factorization.

20218375087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26568928.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 20218375087 in words is "twenty billion, two hundred eighteen million, three hundred seventy-five thousand, eighty-seven".