20556433 has 2 divisors, whose sum is σ = 20556434. Its totient is φ = 20556432.

The previous prime is 20556409. The next prime is 20556467. The reversal of 20556433 is 33465502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18948609 + 1607824 = 4353^2 + 1268^2 .

It is a cyclic number.

It is not a de Polignac number, because 20556433 - 2⁹ = 20555921 is a prime.

It is not a weakly prime, because it can be changed into another prime (20556493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10278216 + 10278217.

It is an arithmetic number, because the mean of its divisors is an integer number (10278217).

Almost surely, 2^20556433 is an apocalyptic number.

It is an amenable number.

20556433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20556433 is an equidigital number, since it uses as much as digits as its factorization.

20556433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 28.

The square root of 20556433 is about 4533.9202683770. The cubic root of 20556433 is about 273.9360898414.

The spelling of 20556433 in words is "twenty million, five hundred fifty-six thousand, four hundred thirty-three".