20522965 has 4 divisors (see below), whose sum is σ = 24627564. Its totient is φ = 16418368.

The previous prime is 20522951. The next prime is 20522977. The reversal of 20522965 is 56922502.

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 2187441 + 18335524 = 1479^2 + 4282^2 .

It is a cyclic number.

It is not a de Polignac number, because 20522965 - 2¹⁹ = 19998677 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent 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, 2052292 + ... + 2052301.

It is an arithmetic number, because the mean of its divisors is an integer number (6156891).

Almost surely, 2^20522965 is an apocalyptic number.

It is an amenable number.

20522965 is a deficient number, since it is larger than the sum of its proper divisors (4104599).

20522965 is an equidigital number, since it uses as much as digits as its factorization.

20522965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4104598.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 20522965 is about 4530.2279192111. The cubic root of 20522965 is about 273.7873436542.

The spelling of 20522965 in words is "twenty million, five hundred twenty-two thousand, nine hundred sixty-five".