20900971 has 8 divisors (see below), whose sum is σ = 25724384. Its totient is φ = 16536960.

The previous prime is 20900933. The next prime is 20900981. The reversal of 20900971 is 17900902.

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 20900971 - 2⁷ = 20900843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20900911) 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, 114750 + ... + 114931.

It is an arithmetic number, because the mean of its divisors is an integer number (3215548).

Almost surely, 2^20900971 is an apocalyptic number.

20900971 is a deficient number, since it is larger than the sum of its proper divisors (4823413).

20900971 is a wasteful number, since it uses less digits than its factorization.

20900971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229701.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 20900971 is about 4571.7579769712. The cubic root of 20900971 is about 275.4580619362.

The spelling of 20900971 in words is "twenty million, nine hundred thousand, nine hundred seventy-one".