20045123345 has 32 divisors (see below), whose sum is σ = 26348263200. Its totient is φ = 14550902784.

The previous prime is 20045123297. The next prime is 20045123383. The reversal of 20045123345 is 54332154002.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 8506926289 + 11538197056 = 92233^2 + 107416^2 .

It is a cyclic number.

It is not a de Polignac number, because 20045123345 - 2⁶ = 20045123281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 990791 + ... + 1010819.

It is an arithmetic number, because the mean of its divisors is an integer number (823383225).

Almost surely, 2^20045123345 is an apocalyptic number.

It is an amenable number.

20045123345 is a deficient number, since it is larger than the sum of its proper divisors (6303139855).

20045123345 is a wasteful number, since it uses less digits than its factorization.

20045123345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20309.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 20045123345 its reverse (54332154002), we get a palindrome (74377277347).

The spelling of 20045123345 in words is "twenty billion, forty-five million, one hundred twenty-three thousand, three hundred forty-five".