20438933 has 2 divisors, whose sum is σ = 20438934. Its totient is φ = 20438932.

The previous prime is 20438923. The next prime is 20438989. The reversal of 20438933 is 33983402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14002564 + 6436369 = 3742^2 + 2537^2 .

It is a cyclic number.

It is not a de Polignac number, because 20438933 - 2¹⁰ = 20437909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_1296626 and since 20438933 and 1296626 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20438933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20438923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219466 + 10219467.

It is an arithmetic number, because the mean of its divisors is an integer number (10219467).

Almost surely, 2^20438933 is an apocalyptic number.

It is an amenable number.

20438933 is a deficient number, since it is larger than the sum of its proper divisors (1).

20438933 is an equidigital number, since it uses as much as digits as its factorization.

20438933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 20438933 is about 4520.9438173903. The cubic root of 20438933 is about 273.4131551855.

The spelling of 20438933 in words is "twenty million, four hundred thirty-eight thousand, nine hundred thirty-three".