20971793 has 2 divisors, whose sum is σ = 20971794. Its totient is φ = 20971792.

The previous prime is 20971789. The next prime is 20971799. The reversal of 20971793 is 39717902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12837889 + 8133904 = 3583^2 + 2852^2 .

It is a cyclic number.

It is not a de Polignac number, because 20971793 - 2² = 20971789 is a prime.

It is a super-2 number, since 2×20971793² = 879632203269698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20971799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10485896 + 10485897.

It is an arithmetic number, because the mean of its divisors is an integer number (10485897).

Almost surely, 2^20971793 is an apocalyptic number.

It is an amenable number.

20971793 is a deficient number, since it is larger than the sum of its proper divisors (1).

20971793 is an equidigital number, since it uses as much as digits as its factorization.

20971793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 20971793 is about 4579.4970247834. The cubic root of 20971793 is about 275.7688369348.

The spelling of 20971793 in words is "twenty million, nine hundred seventy-one thousand, seven hundred ninety-three".