20964319 has 4 divisors (see below), whose sum is σ = 21180544. Its totient is φ = 20748096.

The previous prime is 20964287. The next prime is 20964331. The reversal of 20964319 is 91346902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91346902 = 2 ⋅45673451.

It is a cyclic number.

It is not a de Polignac number, because 20964319 - 2⁵ = 20964287 is a prime.

It is a super-2 number, since 2×20964319² = 879005342267522, 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 (20964919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107967 + ... + 108160.

It is an arithmetic number, because the mean of its divisors is an integer number (5295136).

Almost surely, 2^20964319 is an apocalyptic number.

20964319 is a deficient number, since it is larger than the sum of its proper divisors (216225).

20964319 is an equidigital number, since it uses as much as digits as its factorization.

20964319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216224.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20964319 is about 4578.6809235849. The cubic root of 20964319 is about 275.7360732256.

The spelling of 20964319 in words is "twenty million, nine hundred sixty-four thousand, three hundred nineteen".