20321871 has 8 divisors (see below), whose sum is σ = 27131904. Its totient is φ = 13529880.

The previous prime is 20321869. The next prime is 20321879. The reversal of 20321871 is 17812302.

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

It is not a de Polignac number, because 20321871 - 2¹ = 20321869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321879) 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, 1615 + ... + 6576.

It is an arithmetic number, because the mean of its divisors is an integer number (3391488).

Almost surely, 2^20321871 is an apocalyptic number.

20321871 is a deficient number, since it is larger than the sum of its proper divisors (6810033).

20321871 is an equidigital number, since it uses as much as digits as its factorization.

20321871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9021.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 20321871 is about 4507.9785935605. The cubic root of 20321871 is about 272.8901730538.

The spelling of 20321871 in words is "twenty million, three hundred twenty-one thousand, eight hundred seventy-one".