20964845 has 16 divisors (see below), whose sum is σ = 28639872. Its totient is φ = 14583360.

The previous prime is 20964803. The next prime is 20964851. The reversal of 20964845 is 54846902.

It is not a de Polignac number, because 20964845 - 2⁶ = 20964781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20964799 and 20964808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7022 + ... + 9551.

It is an arithmetic number, because the mean of its divisors is an integer number (1789992).

Almost surely, 2^20964845 is an apocalyptic number.

It is an amenable number.

20964845 is a deficient number, since it is larger than the sum of its proper divisors (7675027).

20964845 is a wasteful number, since it uses less digits than its factorization.

20964845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16612.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 20964845 is about 4578.7383633486. The cubic root of 20964845 is about 275.7383793020.

The spelling of 20964845 in words is "twenty million, nine hundred sixty-four thousand, eight hundred forty-five".