20465311 has 4 divisors (see below), whose sum is σ = 20484072. Its totient is φ = 20446552.

The previous prime is 20465309. The next prime is 20465321. The reversal of 20465311 is 11356402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20465311 - 2¹ = 20465309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20465321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7636 + ... + 9961.

It is an arithmetic number, because the mean of its divisors is an integer number (5121018).

Almost surely, 2^20465311 is an apocalyptic number.

20465311 is a deficient number, since it is larger than the sum of its proper divisors (18761).

20465311 is a wasteful number, since it uses less digits than its factorization.

20465311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18760.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20465311 is about 4523.8601879368. The cubic root of 20465311 is about 273.5307247906.

The spelling of 20465311 in words is "twenty million, four hundred sixty-five thousand, three hundred eleven".