20964839 has 8 divisors (see below), whose sum is σ = 24412320. Its totient is φ = 17630496.

The previous prime is 20964803. The next prime is 20964851. The reversal of 20964839 is 93846902.

It is a happy number.

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 20964839 - 2⁸ = 20964583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20964796 and 20964805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20964439) 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, 27884 + ... + 28625.

It is an arithmetic number, because the mean of its divisors is an integer number (3051540).

Almost surely, 2^20964839 is an apocalyptic number.

20964839 is a deficient number, since it is larger than the sum of its proper divisors (3447481).

20964839 is an equidigital number, since it uses as much as digits as its factorization.

20964839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56569.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20964839 is about 4578.7377081462. The cubic root of 20964839 is about 275.7383529971.

The spelling of 20964839 in words is "twenty million, nine hundred sixty-four thousand, eight hundred thirty-nine".