20964337 has 4 divisors (see below), whose sum is σ = 20980980. Its totient is φ = 20947696.

The previous prime is 20964331. The next prime is 20964343. The reversal of 20964337 is 73346902.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20964331) and next prime (20964343).

It can be written as a sum of positive squares in 2 ways, for example, as 16654561 + 4309776 = 4081^2 + 2076^2 .

It is a cyclic number.

It is not a de Polignac number, because 20964337 - 2¹⁵ = 20931569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20964331) 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, 6262 + ... + 9007.

It is an arithmetic number, because the mean of its divisors is an integer number (5245245).

Almost surely, 2^20964337 is an apocalyptic number.

It is an amenable number.

20964337 is a deficient number, since it is larger than the sum of its proper divisors (16643).

20964337 is a wasteful number, since it uses less digits than its factorization.

20964337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16642.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 20964337 is about 4578.6828892161. The cubic root of 20964337 is about 275.7361521414.

It can be divided in two parts, 209 and 64337, that added together give a palindrome (64546).

The spelling of 20964337 in words is "twenty million, nine hundred sixty-four thousand, three hundred thirty-seven".