20264771 has 4 divisors (see below), whose sum is σ = 21145872. Its totient is φ = 19383672.

The previous prime is 20264747. The next prime is 20264791. The reversal of 20264771 is 17746202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20264771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20264711) 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, 440516 + ... + 440561.

It is an arithmetic number, because the mean of its divisors is an integer number (5286468).

Almost surely, 2^20264771 is an apocalyptic number.

20264771 is a deficient number, since it is larger than the sum of its proper divisors (881101).

20264771 is an equidigital number, since it uses as much as digits as its factorization.

20264771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881100.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20264771 is about 4501.6409230413. The cubic root of 20264771 is about 272.6343461218.

Subtracting from 20264771 its reverse (17746202), we obtain a square (2518569 = 1587²).

The spelling of 20264771 in words is "twenty million, two hundred sixty-four thousand, seven hundred seventy-one".