20544871 has 6 divisors (see below), whose sum is σ = 21683472. Its totient is φ = 19463220.

The previous prime is 20544851. The next prime is 20544889. The reversal of 20544871 is 17844502.

It is not a de Polignac number, because 20544871 - 2⁷ = 20544743 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 (20544851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28095 + ... + 28816.

It is an arithmetic number, because the mean of its divisors is an integer number (3613912).

Almost surely, 2^20544871 is an apocalyptic number.

20544871 is a deficient number, since it is larger than the sum of its proper divisors (1138601).

20544871 is an equidigital number, since it uses as much as digits as its factorization.

20544871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56949 (or 56930 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 20544871 is about 4532.6450335317. The cubic root of 20544871 is about 273.8847216060.

The spelling of 20544871 in words is "twenty million, five hundred forty-four thousand, eight hundred seventy-one".