20452945 has 4 divisors (see below), whose sum is σ = 24543540. Its totient is φ = 16362352.

The previous prime is 20452937. The next prime is 20452967. The reversal of 20452945 is 54925402.

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 11015761 + 9437184 = 3319^2 + 3072^2 .

It is a cyclic number.

It is not a de Polignac number, because 20452945 - 2³ = 20452937 is a prime.

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, 2045290 + ... + 2045299.

It is an arithmetic number, because the mean of its divisors is an integer number (6135885).

Almost surely, 2^20452945 is an apocalyptic number.

It is an amenable number.

20452945 is a deficient number, since it is larger than the sum of its proper divisors (4090595).

20452945 is an equidigital number, since it uses as much as digits as its factorization.

20452945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090594.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 20452945 is about 4522.4932282979. The cubic root of 20452945 is about 273.4756207750.

The spelling of 20452945 in words is "twenty million, four hundred fifty-two thousand, nine hundred forty-five".