20854821 has 8 divisors (see below), whose sum is σ = 29945440. Its totient is φ = 12833712.

The previous prime is 20854739. The next prime is 20854843. The reversal of 20854821 is 12845802.

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

It is not a de Polignac number, because 20854821 - 2⁷ = 20854693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20854891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267331 + ... + 267408.

It is an arithmetic number, because the mean of its divisors is an integer number (3743180).

Almost surely, 2^20854821 is an apocalyptic number.

It is an amenable number.

20854821 is a deficient number, since it is larger than the sum of its proper divisors (9090619).

20854821 is a wasteful number, since it uses less digits than its factorization.

20854821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534755.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 20854821 is about 4566.7078951910. The cubic root of 20854821 is about 275.2551725186.

The spelling of 20854821 in words is "twenty million, eight hundred fifty-four thousand, eight hundred twenty-one".