20965711 has 4 divisors (see below), whose sum is σ = 22578472. Its totient is φ = 19352952.

The previous prime is 20965669. The next prime is 20965723. The reversal of 20965711 is 11756902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11756902 = 2 ⋅5878451.

It is a cyclic number.

It is not a de Polignac number, because 20965711 - 2²¹ = 18868559 is a prime.

It is a super-2 number, since 2×20965711² = 879122075471042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965741) 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, 806361 + ... + 806386.

It is an arithmetic number, because the mean of its divisors is an integer number (5644618).

Almost surely, 2^20965711 is an apocalyptic number.

20965711 is a deficient number, since it is larger than the sum of its proper divisors (1612761).

20965711 is a wasteful number, since it uses less digits than its factorization.

20965711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612760.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 20965711 is about 4578.8329299069. The cubic root of 20965711 is about 275.7421759140.

The spelling of 20965711 in words is "twenty million, nine hundred sixty-five thousand, seven hundred eleven".