20618022155 has 4 divisors (see below), whose sum is σ = 24741626592. Its totient is φ = 16494417720.

The previous prime is 20618022031. The next prime is 20618022157. The reversal of 20618022155 is 55122081602.

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

It is not a de Polignac number, because 20618022155 - 2³² = 16323054859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20618022157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2061802211 + ... + 2061802220.

It is an arithmetic number, because the mean of its divisors is an integer number (6185406648).

Almost surely, 2^20618022155 is an apocalyptic number.

20618022155 is a deficient number, since it is larger than the sum of its proper divisors (4123604437).

20618022155 is an equidigital number, since it uses as much as digits as its factorization.

20618022155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4123604436.

The product of its (nonzero) digits is 9600, while the sum is 32.

The spelling of 20618022155 in words is "twenty billion, six hundred eighteen million, twenty-two thousand, one hundred fifty-five".