20051671 has 4 divisors (see below), whose sum is σ = 20083032. Its totient is φ = 20020312.

The previous prime is 20051663. The next prime is 20051677. The reversal of 20051671 is 17615002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20051671 - 2³ = 20051663 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 (20051677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14701 + ... + 16006.

It is an arithmetic number, because the mean of its divisors is an integer number (5020758).

Almost surely, 2^20051671 is an apocalyptic number.

20051671 is a deficient number, since it is larger than the sum of its proper divisors (31361).

20051671 is an equidigital number, since it uses as much as digits as its factorization.

20051671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31360.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20051671 is about 4477.9092219472. The cubic root of 20051671 is about 271.6753217579.

Adding to 20051671 its reverse (17615002), we get a palindrome (37666673).

The spelling of 20051671 in words is "twenty million, fifty-one thousand, six hundred seventy-one".