20045245155 has 32 divisors (see below), whose sum is σ = 34585743360. Its totient is φ = 9855216000.

The previous prime is 20045245123. The next prime is 20045245159. The reversal of 20045245155 is 55154254002.

It is not a de Polignac number, because 20045245155 - 2⁵ = 20045245123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20045245159) 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 31 ways as a sum of consecutive naturals, for example, 78006 + ... + 214884.

It is an arithmetic number, because the mean of its divisors is an integer number (1080804480).

Almost surely, 2^20045245155 is an apocalyptic number.

20045245155 is a deficient number, since it is larger than the sum of its proper divisors (14540498205).

20045245155 is a wasteful number, since it uses less digits than its factorization.

20045245155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137651.

The product of its (nonzero) digits is 40000, while the sum is 33.

Adding to 20045245155 its reverse (55154254002), we get a palindrome (75199499157).

The spelling of 20045245155 in words is "twenty billion, forty-five million, two hundred forty-five thousand, one hundred fifty-five".