20964616 has 8 divisors (see below), whose sum is σ = 39308670. Its totient is φ = 10482304.

The previous prime is 20964613. The next prime is 20964631. The reversal of 20964616 is 61646902.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 5044516 = 3990^2 + 2246^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20964611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310281 + ... + 1310296.

Almost surely, 2^20964616 is an apocalyptic number.

It is an amenable number.

20964616 is a deficient number, since it is larger than the sum of its proper divisors (18344054).

20964616 is a wasteful number, since it uses less digits than its factorization.

20964616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620583 (or 2620579 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20964616 is about 4578.7133563917. The cubic root of 20964616 is about 275.7373753305.

The spelling of 20964616 in words is "twenty million, nine hundred sixty-four thousand, six hundred sixteen".