20893845 has 64 divisors (see below), whose sum is σ = 40550400. Its totient is φ = 9172800.

The previous prime is 20893811. The next prime is 20893849. The reversal of 20893845 is 54839802.

It is a happy number.

It is not a de Polignac number, because 20893845 - 2⁸ = 20893589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20893849) 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 63 ways as a sum of consecutive naturals, for example, 159430 + ... + 159560.

It is an arithmetic number, because the mean of its divisors is an integer number (633600).

Almost surely, 2^20893845 is an apocalyptic number.

It is an amenable number.

20893845 is a deficient number, since it is larger than the sum of its proper divisors (19656555).

20893845 is a wasteful number, since it uses less digits than its factorization.

20893845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 20893845 is about 4570.9785604398. The cubic root of 20893845 is about 275.4267533865.

The spelling of 20893845 in words is "twenty million, eight hundred ninety-three thousand, eight hundred forty-five".