20894145 has 8 divisors (see below), whose sum is σ = 33430656. Its totient is φ = 11143536.

The previous prime is 20894131. The next prime is 20894149. The reversal of 20894145 is 54149802.

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

It is not a de Polignac number, because 20894145 - 2⁸ = 20893889 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20894149) 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 in 7 ways as a sum of consecutive naturals, for example, 696457 + ... + 696486.

It is an arithmetic number, because the mean of its divisors is an integer number (4178832).

Almost surely, 2^20894145 is an apocalyptic number.

It is an amenable number.

20894145 is a deficient number, since it is larger than the sum of its proper divisors (12536511).

20894145 is a wasteful number, since it uses less digits than its factorization.

20894145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392951.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 20894145 is about 4571.0113760524. The cubic root of 20894145 is about 275.4280715997.

The spelling of 20894145 in words is "twenty million, eight hundred ninety-four thousand, one hundred forty-five".