20971109 has 8 divisors (see below), whose sum is σ = 21403200. Its totient is φ = 20543616.

The previous prime is 20971063. The next prime is 20971121. The reversal of 20971109 is 90117902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20971109 - 2⁸ = 20970853 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 (20971409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8942 + ... + 11040.

It is an arithmetic number, because the mean of its divisors is an integer number (2675400).

Almost surely, 2^20971109 is an apocalyptic number.

It is an amenable number.

20971109 is a deficient number, since it is larger than the sum of its proper divisors (432091).

20971109 is a wasteful number, since it uses less digits than its factorization.

20971109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 20971109 is about 4579.4223434839. The cubic root of 20971109 is about 275.7658388136.

The spelling of 20971109 in words is "twenty million, nine hundred seventy-one thousand, one hundred nine".