20146775855 has 4 divisors (see below), whose sum is σ = 24176131032. Its totient is φ = 16117420680.

The previous prime is 20146775851. The next prime is 20146775881. The reversal of 20146775855 is 55857764102.

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

It is not a de Polignac number, because 20146775855 - 2² = 20146775851 is a prime.

It is a super-3 number, since 3×20146775855³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20146775851) 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, 2014677581 + ... + 2014677590.

It is an arithmetic number, because the mean of its divisors is an integer number (6044032758).

Almost surely, 2^20146775855 is an apocalyptic number.

20146775855 is a deficient number, since it is larger than the sum of its proper divisors (4029355177).

20146775855 is an equidigital number, since it uses as much as digits as its factorization.

20146775855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029355176.

The product of its (nonzero) digits is 2352000, while the sum is 50.

The spelling of 20146775855 in words is "twenty billion, one hundred forty-six million, seven hundred seventy-five thousand, eight hundred fifty-five".