20465897 has 4 divisors (see below), whose sum is σ = 20852100. Its totient is φ = 20079696.

The previous prime is 20465873. The next prime is 20465899. The reversal of 20465897 is 79856402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79856402 = 2 ⋅39928201.

It can be written as a sum of positive squares in 2 ways, for example, as 17606416 + 2859481 = 4196^2 + 1691^2 .

It is a cyclic number.

It is not a de Polignac number, because 20465897 - 2⁶ = 20465833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20465899) 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, 193022 + ... + 193127.

It is an arithmetic number, because the mean of its divisors is an integer number (5213025).

Almost surely, 2^20465897 is an apocalyptic number.

It is an amenable number.

20465897 is a deficient number, since it is larger than the sum of its proper divisors (386203).

20465897 is an equidigital number, since it uses as much as digits as its factorization.

20465897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386202.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 20465897 is about 4523.9249551689. The cubic root of 20465897 is about 273.5333355087.

The spelling of 20465897 in words is "twenty million, four hundred sixty-five thousand, eight hundred ninety-seven".