20700971 has 4 divisors (see below), whose sum is σ = 20712000. Its totient is φ = 20689944.

The previous prime is 20700961. The next prime is 20701001. The reversal of 20700971 is 17900702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20700971 - 2¹⁰ = 20699947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20700971.

It is not an unprimeable number, because it can be changed into a prime (20700961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1916 + ... + 6713.

It is an arithmetic number, because the mean of its divisors is an integer number (5178000).

Almost surely, 2^20700971 is an apocalyptic number.

20700971 is a deficient number, since it is larger than the sum of its proper divisors (11029).

20700971 is an equidigital number, since it uses as much as digits as its factorization.

20700971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11028.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 20700971 is about 4549.8319749195. The cubic root of 20700971 is about 274.5766311931.

The spelling of 20700971 in words is "twenty million, seven hundred thousand, nine hundred seventy-one".