20108971 has 4 divisors (see below), whose sum is σ = 20229552. Its totient is φ = 19988392.

The previous prime is 20108951. The next prime is 20108981. The reversal of 20108971 is 17980102.

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 20108971 - 2⁵ = 20108939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20108941) 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, 60040 + ... + 60373.

It is an arithmetic number, because the mean of its divisors is an integer number (5057388).

Almost surely, 2^20108971 is an apocalyptic number.

20108971 is a deficient number, since it is larger than the sum of its proper divisors (120581).

20108971 is a wasteful number, since it uses less digits than its factorization.

20108971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120580.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 20108971 is about 4484.3027328672. The cubic root of 20108971 is about 271.9338570068.

The spelling of 20108971 in words is "twenty million, one hundred eight thousand, nine hundred seventy-one".