20964493 has 4 divisors (see below), whose sum is σ = 22870368. Its totient is φ = 19058620.

The previous prime is 20964481. The next prime is 20964497. The reversal of 20964493 is 39446902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20964493 - 2⁹ = 20963981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20964497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 952921 + ... + 952942.

It is an arithmetic number, because the mean of its divisors is an integer number (5717592).

Almost surely, 2^20964493 is an apocalyptic number.

It is an amenable number.

20964493 is a deficient number, since it is larger than the sum of its proper divisors (1905875).

20964493 is a wasteful number, since it uses less digits than its factorization.

20964493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905874.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 20964493 is about 4578.6999246511. The cubic root of 20964493 is about 275.7368360764.

The spelling of 20964493 in words is "twenty million, nine hundred sixty-four thousand, four hundred ninety-three".