20020871 has 8 divisors (see below), whose sum is σ = 21915264. Its totient is φ = 18177120.

The previous prime is 20020841. The next prime is 20020901. The reversal of 20020871 is 17802002.

It is an interprime number because it is at equal distance from previous prime (20020841) and next prime (20020901).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20020871 - 2¹⁴ = 20004487 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 (20020841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11831 + ... + 13416.

It is an arithmetic number, because the mean of its divisors is an integer number (2739408).

Almost surely, 2^20020871 is an apocalyptic number.

20020871 is a deficient number, since it is larger than the sum of its proper divisors (1894393).

20020871 is a wasteful number, since it uses less digits than its factorization.

20020871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25321.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 20020871 is about 4474.4687952873. The cubic root of 20020871 is about 271.5361498510.

Adding to 20020871 its reverse (17802002), we get a palindrome (37822873).

The spelling of 20020871 in words is "twenty million, twenty thousand, eight hundred seventy-one".