20443939 has 2 divisors, whose sum is σ = 20443940. Its totient is φ = 20443938.

The previous prime is 20443937. The next prime is 20443957. The reversal of 20443939 is 93934402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20443939 - 2¹ = 20443937 is a prime.

Together with 20443937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20443933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221969 + 10221970.

It is an arithmetic number, because the mean of its divisors is an integer number (10221970).

Almost surely, 2^20443939 is an apocalyptic number.

20443939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443939 is an equidigital number, since it uses as much as digits as its factorization.

20443939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 20443939 is about 4521.4974289498. The cubic root of 20443939 is about 273.4354752438.

It can be divided in two parts, 2044393 and 9, that added together give a palindrome (2044402).

The spelling of 20443939 in words is "twenty million, four hundred forty-three thousand, nine hundred thirty-nine".