20465457 has 4 divisors (see below), whose sum is σ = 27287280. Its totient is φ = 13643636.

The previous prime is 20465449. The next prime is 20465491. The reversal of 20465457 is 75456402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20465457 - 2³ = 20465449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20465407) 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 3 ways as a sum of consecutive naturals, for example, 3410907 + ... + 3410912.

It is an arithmetic number, because the mean of its divisors is an integer number (6821820).

Almost surely, 2^20465457 is an apocalyptic number.

It is an amenable number.

20465457 is a deficient number, since it is larger than the sum of its proper divisors (6821823).

20465457 is an equidigital number, since it uses as much as digits as its factorization.

20465457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6821822.

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 20465457 is about 4523.8763245695. The cubic root of 20465457 is about 273.5313752472.

It can be divided in two parts, 2046 and 5457, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 20465457 in words is "twenty million, four hundred sixty-five thousand, four hundred fifty-seven".