20445254155 has 4 divisors (see below), whose sum is σ = 24534304992. Its totient is φ = 16356203320.

The previous prime is 20445254111. The next prime is 20445254201. The reversal of 20445254155 is 55145254402.

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

It is a de Polignac number, because none of the positive numbers 2^k-20445254155 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, 2044525411 + ... + 2044525420.

It is an arithmetic number, because the mean of its divisors is an integer number (6133576248).

Almost surely, 2^20445254155 is an apocalyptic number.

20445254155 is a deficient number, since it is larger than the sum of its proper divisors (4089050837).

20445254155 is an equidigital number, since it uses as much as digits as its factorization.

20445254155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089050836.

The product of its (nonzero) digits is 160000, while the sum is 37.

The spelling of 20445254155 in words is "twenty billion, four hundred forty-five million, two hundred fifty-four thousand, one hundred fifty-five".