20525345 has 4 divisors (see below), whose sum is σ = 24630420. Its totient is φ = 16420272.

The previous prime is 20525311. The next prime is 20525347. The reversal of 20525345 is 54352502.

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 14409616 + 6115729 = 3796^2 + 2473^2 .

It is a cyclic number.

It is not a de Polignac number, because 20525345 - 2¹⁶ = 20459809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20525347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052530 + ... + 2052539.

It is an arithmetic number, because the mean of its divisors is an integer number (6157605).

Almost surely, 2^20525345 is an apocalyptic number.

It is an amenable number.

20525345 is a deficient number, since it is larger than the sum of its proper divisors (4105075).

20525345 is an equidigital number, since it uses as much as digits as its factorization.

20525345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105074.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 20525345 is about 4530.4905915364. The cubic root of 20525345 is about 273.7979267366.

Adding to 20525345 its reverse (54352502), we get a palindrome (74877847).

The spelling of 20525345 in words is "twenty million, five hundred twenty-five thousand, three hundred forty-five".