20457065 has 8 divisors (see below), whose sum is σ = 24598728. Its totient is φ = 16332160.

The previous prime is 20457049. The next prime is 20457067. The reversal of 20457065 is 56075402.

It can be written as a sum of positive squares in 4 ways, for example, as 243049 + 20214016 = 493^2 + 4496^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20457065 - 2⁴ = 20457049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20457067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1322 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (3074841).

Almost surely, 2^20457065 is an apocalyptic number.

It is an amenable number.

20457065 is a deficient number, since it is larger than the sum of its proper divisors (4141663).

20457065 is an equidigital number, since it uses as much as digits as its factorization.

20457065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8379.

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

The square root of 20457065 is about 4522.9487063198. The cubic root of 20457065 is about 273.4939823347.

The spelling of 20457065 in words is "twenty million, four hundred fifty-seven thousand, sixty-five".