20425671 has 12 divisors (see below), whose sum is σ = 33718672. Its totient is φ = 11671776.

The previous prime is 20425637. The next prime is 20425673. The reversal of 20425671 is 17652402.

It is not a de Polignac number, because 20425671 - 2⁶ = 20425607 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 (20425673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162046 + ... + 162171.

Almost surely, 2^20425671 is an apocalyptic number.

20425671 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20425671 is a deficient number, since it is larger than the sum of its proper divisors (13293001).

20425671 is a wasteful number, since it uses less digits than its factorization.

20425671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324230 (or 324227 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20425671 is about 4519.4768502560. The cubic root of 20425671 is about 273.3540067978.

The spelling of 20425671 in words is "twenty million, four hundred twenty-five thousand, six hundred seventy-one".