20049993 has 6 divisors (see below), whose sum is σ = 28961114. Its totient is φ = 13366656.

The previous prime is 20049989. The next prime is 20050003. The reversal of 20049993 is 39994002.

It can be written as a sum of positive squares in only one way, i.e., 14837904 + 5212089 = 3852^2 + 2283^2 .

It is not a de Polignac number, because 20049993 - 2² = 20049989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20049973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1113880 + ... + 1113897.

Almost surely, 2^20049993 is an apocalyptic number.

It is an amenable number.

20049993 is a deficient number, since it is larger than the sum of its proper divisors (8911121).

20049993 is a wasteful number, since it uses less digits than its factorization.

20049993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227783 (or 2227780 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 20049993 is about 4477.7218538002. The cubic root of 20049993 is about 271.6677432721.

It can be divided in two parts, 2004999 and 3, that added together give a palindrome (2005002).

The spelling of 20049993 in words is "twenty million, forty-nine thousand, nine hundred ninety-three".