20964669 has 8 divisors (see below), whose sum is σ = 30494112. Its totient is φ = 12705840.

The previous prime is 20964637. The next prime is 20964673. The reversal of 20964669 is 96646902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20964669 - 2⁵ = 20964637 is a prime.

It is a super-2 number, since 2×20964669² = 879034692559122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20964669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20964169) 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 7 ways as a sum of consecutive naturals, for example, 317614 + ... + 317679.

It is an arithmetic number, because the mean of its divisors is an integer number (3811764).

Almost surely, 2^20964669 is an apocalyptic number.

It is an amenable number.

20964669 is a deficient number, since it is larger than the sum of its proper divisors (9529443).

20964669 is a wasteful number, since it uses less digits than its factorization.

20964669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635307.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 20964669 is about 4578.7191440402. The cubic root of 20964669 is about 275.7376076914.

The spelling of 20964669 in words is "twenty million, nine hundred sixty-four thousand, six hundred sixty-nine".