20203871 has 8 divisors (see below), whose sum is σ = 21744144. Its totient is φ = 18702720.

The previous prime is 20203861. The next prime is 20203877. The reversal of 20203871 is 17830202.

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

It is a de Polignac number, because none of the positive numbers 2^k-20203871 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 (20203877) 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 7 ways as a sum of consecutive naturals, for example, 8705 + ... + 10778.

It is an arithmetic number, because the mean of its divisors is an integer number (2718018).

Almost surely, 2^20203871 is an apocalyptic number.

20203871 is a deficient number, since it is larger than the sum of its proper divisors (1540273).

20203871 is a wasteful number, since it uses less digits than its factorization.

20203871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19561.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20203871 is about 4494.8716333172. The cubic root of 20203871 is about 272.3609637776.

The spelling of 20203871 in words is "twenty million, two hundred three thousand, eight hundred seventy-one".