20805433 has 32 divisors (see below), whose sum is σ = 25740288. Its totient is φ = 16588800.

The previous prime is 20805431. The next prime is 20805451. The reversal of 20805433 is 33450802.

It is a cyclic number.

It is not a de Polignac number, because 20805433 - 2¹ = 20805431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20805398 and 20805407.

It is not an unprimeable number, because it can be changed into a prime (20805431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 214441 + ... + 214537.

It is an arithmetic number, because the mean of its divisors is an integer number (804384).

Almost surely, 2^20805433 is an apocalyptic number.

It is an amenable number.

20805433 is a deficient number, since it is larger than the sum of its proper divisors (4934855).

20805433 is a wasteful number, since it uses less digits than its factorization.

20805433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20805433 is about 4561.2972935339. The cubic root of 20805433 is about 275.0377160392.

The spelling of 20805433 in words is "twenty million, eight hundred five thousand, four hundred thirty-three".