20512045 has 4 divisors (see below), whose sum is σ = 24614460. Its totient is φ = 16409632.

The previous prime is 20512031. The next prime is 20512073. The reversal of 20512045 is 54021502.

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 4206601 + 16305444 = 2051^2 + 4038^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20512045 is a prime.

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, 2051200 + ... + 2051209.

It is an arithmetic number, because the mean of its divisors is an integer number (6153615).

Almost surely, 2^20512045 is an apocalyptic number.

It is an amenable number.

20512045 is a deficient number, since it is larger than the sum of its proper divisors (4102415).

20512045 is an equidigital number, since it uses as much as digits as its factorization.

20512045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102414.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20512045 is about 4529.0225214719. The cubic root of 20512045 is about 273.7387754897.

Adding to 20512045 its reverse (54021502), we get a palindrome (74533547).

It can be divided in two parts, 2051 and 2045, that added together give a 12-th power (4096 = 2¹²).

The spelling of 20512045 in words is "twenty million, five hundred twelve thousand, forty-five".