20507045 has 8 divisors (see below), whose sum is σ = 26501496. Its totient is φ = 15143616.

The previous prime is 20507033. The next prime is 20507051. The reversal of 20507045 is 54070502.

It can be written as a sum of positive squares in 4 ways, for example, as 139876 + 20367169 = 374^2 + 4513^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20507045 - 2⁸ = 20506789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20507045.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157682 + ... + 157811.

It is an arithmetic number, because the mean of its divisors is an integer number (3312687).

Almost surely, 2^20507045 is an apocalyptic number.

It is an amenable number.

20507045 is a deficient number, since it is larger than the sum of its proper divisors (5994451).

20507045 is a wasteful number, since it uses less digits than its factorization.

20507045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315511.

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 20507045 is about 4528.4704923407. The cubic root of 20507045 is about 273.7165315658.

Adding to 20507045 its reverse (54070502), we get a palindrome (74577547).

The spelling of 20507045 in words is "twenty million, five hundred seven thousand, forty-five".