20072545 has 8 divisors (see below), whose sum is σ = 24143400. Its totient is φ = 16020480.

The previous prime is 20072543. The next prime is 20072561. The reversal of 20072545 is 54527002.

It can be written as a sum of positive squares in 4 ways, for example, as 3936256 + 16136289 = 1984^2 + 4017^2 .

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

It is not a de Polignac number, because 20072545 - 2¹ = 20072543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20072543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2226 + ... + 6715.

It is an arithmetic number, because the mean of its divisors is an integer number (3017925).

Almost surely, 2^20072545 is an apocalyptic number.

It is an amenable number.

20072545 is a deficient number, since it is larger than the sum of its proper divisors (4070855).

20072545 is an equidigital number, since it uses as much as digits as its factorization.

20072545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9395.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20072545 is about 4480.2393909254. The cubic root of 20072545 is about 271.7695613512.

Adding to 20072545 its reverse (54527002), we get a palindrome (74599547).

The spelling of 20072545 in words is "twenty million, seventy-two thousand, five hundred forty-five".