20525465 has 4 divisors (see below), whose sum is σ = 24630564. Its totient is φ = 16420368.

The previous prime is 20525459. The next prime is 20525497. The reversal of 20525465 is 56452502.

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 5494336 + 15031129 = 2344^2 + 3877^2 .

It is a cyclic number.

It is not a de Polignac number, because 20525465 - 2¹⁴ = 20509081 is a prime.

It is a Duffinian number.

It is a Curzon 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, 2052542 + ... + 2052551.

It is an arithmetic number, because the mean of its divisors is an integer number (6157641).

Almost surely, 2^20525465 is an apocalyptic number.

It is an amenable number.

20525465 is a deficient number, since it is larger than the sum of its proper divisors (4105099).

20525465 is an equidigital number, since it uses as much as digits as its factorization.

20525465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105098.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 20525465 is about 4530.5038351159. The cubic root of 20525465 is about 273.7984603157.

Adding to 20525465 its reverse (56452502), we get a palindrome (76977967).

The spelling of 20525465 in words is "twenty million, five hundred twenty-five thousand, four hundred sixty-five".