20425971 has 4 divisors (see below), whose sum is σ = 27234632. Its totient is φ = 13617312.

The previous prime is 20425967. The next prime is 20425981. The reversal of 20425971 is 17952402.

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

It is not a de Polignac number, because 20425971 - 2² = 20425967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20425981) 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, 3404326 + ... + 3404331.

It is an arithmetic number, because the mean of its divisors is an integer number (6808658).

Almost surely, 2^20425971 is an apocalyptic number.

20425971 is a deficient number, since it is larger than the sum of its proper divisors (6808661).

20425971 is an equidigital number, since it uses as much as digits as its factorization.

20425971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6808660.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20425971 is about 4519.5100398163. The cubic root of 20425971 is about 273.3553450777.

The spelling of 20425971 in words is "twenty million, four hundred twenty-five thousand, nine hundred seventy-one".