20120671 has 4 divisors (see below), whose sum is σ = 20131272. Its totient is φ = 20110072.

The previous prime is 20120657. The next prime is 20120713. The reversal of 20120671 is 17602102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20120671 - 2⁷ = 20120543 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 (20120641) 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, 1585 + ... + 6538.

It is an arithmetic number, because the mean of its divisors is an integer number (5032818).

Almost surely, 2^20120671 is an apocalyptic number.

20120671 is a deficient number, since it is larger than the sum of its proper divisors (10601).

20120671 is an equidigital number, since it uses as much as digits as its factorization.

20120671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10600.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 20120671 is about 4485.6070938057. The cubic root of 20120671 is about 271.9865865286.

Adding to 20120671 its reverse (17602102), we get a palindrome (37722773).

Subtracting from 20120671 its reverse (17602102), we obtain a square (2518569 = 1587²).

The spelling of 20120671 in words is "twenty million, one hundred twenty thousand, six hundred seventy-one".