20029993 has 2 divisors, whose sum is σ = 20029994. Its totient is φ = 20029992.

The previous prime is 20029991. The next prime is 20030011. The reversal of 20029993 is 39992002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16297369 + 3732624 = 4037^2 + 1932^2 .

It is a cyclic number.

It is not a de Polignac number, because 20029993 - 2¹ = 20029991 is a prime.

Together with 20029991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20029991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10014996 + 10014997.

It is an arithmetic number, because the mean of its divisors is an integer number (10014997).

Almost surely, 2^20029993 is an apocalyptic number.

It is an amenable number.

20029993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20029993 is an equidigital number, since it uses as much as digits as its factorization.

20029993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 20029993 is about 4475.4880180825. The cubic root of 20029993 is about 271.5773830998.

It can be divided in two parts, 2002999 and 3, that added together give a palindrome (2003002).

The spelling of 20029993 in words is "twenty million, twenty-nine thousand, nine hundred ninety-three".