20845761 has 8 divisors (see below), whose sum is σ = 27823104. Its totient is φ = 13882800.

The previous prime is 20845711. The next prime is 20845771. The reversal of 20845761 is 16754802.

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

It is not a de Polignac number, because 20845761 - 2⁶ = 20845697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20845711) 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, 435 + ... + 6471.

It is an arithmetic number, because the mean of its divisors is an integer number (3477888).

Almost surely, 2^20845761 is an apocalyptic number.

It is an amenable number.

20845761 is a deficient number, since it is larger than the sum of its proper divisors (6977343).

20845761 is a wasteful number, since it uses less digits than its factorization.

20845761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7191.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20845761 is about 4565.7158255853. The cubic root of 20845761 is about 275.2153068670.

The spelling of 20845761 in words is "twenty million, eight hundred forty-five thousand, seven hundred sixty-one".