20602993 has 4 divisors (see below), whose sum is σ = 20893248. Its totient is φ = 20312740.

The previous prime is 20602991. The next prime is 20602999. The reversal of 20602993 is 39920602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20602993 - 2¹ = 20602991 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20602991) 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 3 ways as a sum of consecutive naturals, for example, 145021 + ... + 145162.

It is an arithmetic number, because the mean of its divisors is an integer number (5223312).

Almost surely, 2^20602993 is an apocalyptic number.

It is an amenable number.

20602993 is a deficient number, since it is larger than the sum of its proper divisors (290255).

20602993 is an equidigital number, since it uses as much as digits as its factorization.

20602993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290254.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 20602993 is about 4539.0519935335. The cubic root of 20602993 is about 274.1427542124.

The spelling of 20602993 in words is "twenty million, six hundred two thousand, nine hundred ninety-three".