20996845 has 8 divisors (see below), whose sum is σ = 25351776. Its totient is φ = 16693776.

The previous prime is 20996803. The next prime is 20996849. The reversal of 20996845 is 54869902.

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

It is a cyclic number.

It is not a de Polignac number, because 20996845 - 2¹⁷ = 20865773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20996849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12067 + ... + 13696.

It is an arithmetic number, because the mean of its divisors is an integer number (3168972).

Almost surely, 2^20996845 is an apocalyptic number.

It is an amenable number.

20996845 is a deficient number, since it is larger than the sum of its proper divisors (4354931).

20996845 is a wasteful number, since it uses less digits than its factorization.

20996845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25931.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 20996845 is about 4582.2314433036. The cubic root of 20996845 is about 275.8786004290.

The spelling of 20996845 in words is "twenty million, nine hundred ninety-six thousand, eight hundred forty-five".