20102045 has 4 divisors (see below), whose sum is σ = 24122460. Its totient is φ = 16081632.

The previous prime is 20102029. The next prime is 20102087. The reversal of 20102045 is 54020102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14546596 + 5555449 = 3814^2 + 2357^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102045 - 2⁴ = 20102029 is a prime.

It is a Curzon number.

It is a congruent 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, 2010200 + ... + 2010209.

It is an arithmetic number, because the mean of its divisors is an integer number (6030615).

Almost surely, 2^20102045 is an apocalyptic number.

It is an amenable number.

20102045 is a deficient number, since it is larger than the sum of its proper divisors (4020415).

20102045 is an equidigital number, since it uses as much as digits as its factorization.

20102045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020414.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20102045 is about 4483.5304169817. The cubic root of 20102045 is about 271.9026332947.

Adding to 20102045 its reverse (54020102), we get a palindrome (74122147).

The spelling of 20102045 in words is "twenty million, one hundred two thousand, forty-five".