20321171 has 8 divisors (see below), whose sum is σ = 23171904. Its totient is φ = 17654400.

The previous prime is 20321159. The next prime is 20321173. The reversal of 20321171 is 17112302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321171 is a prime.

It is a super-2 number, since 2×20321171² = 825899981622482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321173) 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, 45755 + ... + 46196.

It is an arithmetic number, because the mean of its divisors is an integer number (2896488).

Almost surely, 2^20321171 is an apocalyptic number.

20321171 is a deficient number, since it is larger than the sum of its proper divisors (2850733).

20321171 is a wasteful number, since it uses less digits than its factorization.

20321171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91981.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 20321171 is about 4507.9009527717. The cubic root of 20321171 is about 272.8870397249.

Adding to 20321171 its reverse (17112302), we get a palindrome (37433473).

The spelling of 20321171 in words is "twenty million, three hundred twenty-one thousand, one hundred seventy-one".