20522765 has 4 divisors (see below), whose sum is σ = 24627324. Its totient is φ = 16418208.

The previous prime is 20522743. The next prime is 20522767. The reversal of 20522765 is 56722502.

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 3200521 + 17322244 = 1789^2 + 4162^2 .

It is a cyclic number.

It is not a de Polignac number, because 20522765 - 2¹² = 20518669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20522767) 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, 2052272 + ... + 2052281.

It is an arithmetic number, because the mean of its divisors is an integer number (6156831).

Almost surely, 2^20522765 is an apocalyptic number.

It is an amenable number.

20522765 is a deficient number, since it is larger than the sum of its proper divisors (4104559).

20522765 is an equidigital number, since it uses as much as digits as its factorization.

20522765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4104558.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 20522765 is about 4530.2058452128. The cubic root of 20522765 is about 273.7864542822.

The spelling of 20522765 in words is "twenty million, five hundred twenty-two thousand, seven hundred sixty-five".