20418771 has 4 divisors (see below), whose sum is σ = 27225032. Its totient is φ = 13612512.

The previous prime is 20418767. The next prime is 20418773. The reversal of 20418771 is 17781402.

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

It is not a de Polignac number, because 20418771 - 2² = 20418767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20418773) 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, 3403126 + ... + 3403131.

It is an arithmetic number, because the mean of its divisors is an integer number (6806258).

Almost surely, 2^20418771 is an apocalyptic number.

20418771 is a deficient number, since it is larger than the sum of its proper divisors (6806261).

20418771 is an equidigital number, since it uses as much as digits as its factorization.

20418771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6806260.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 20418771 is about 4518.7134230885. The cubic root of 20418771 is about 273.3232227406.

The spelling of 20418771 in words is "twenty million, four hundred eighteen thousand, seven hundred seventy-one".