20854433 has 4 divisors (see below), whose sum is σ = 20868420. Its totient is φ = 20840448.

The previous prime is 20854429. The next prime is 20854447. The reversal of 20854433 is 33445802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18731584 + 2122849 = 4328^2 + 1457^2 .

It is a cyclic number.

It is not a de Polignac number, because 20854433 - 2² = 20854429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20854396 and 20854405.

It is not an unprimeable number, because it can be changed into a prime (20854033) 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 3 ways as a sum of consecutive naturals, for example, 4448 + ... + 7841.

It is an arithmetic number, because the mean of its divisors is an integer number (5217105).

Almost surely, 2^20854433 is an apocalyptic number.

It is an amenable number.

20854433 is a deficient number, since it is larger than the sum of its proper divisors (13987).

20854433 is a wasteful number, since it uses less digits than its factorization.

20854433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13986.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20854433 is about 4566.6654136251. The cubic root of 20854433 is about 275.2534654845.

The spelling of 20854433 in words is "twenty million, eight hundred fifty-four thousand, four hundred thirty-three".