20464993 has 4 divisors (see below), whose sum is σ = 20479680. Its totient is φ = 20450308.

The previous prime is 20464987. The next prime is 20465041. The reversal of 20464993 is 39946402.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39946402 = 2 ⋅19973201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20464993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20464903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5005 + ... + 8122.

It is an arithmetic number, because the mean of its divisors is an integer number (5119920).

Almost surely, 2^20464993 is an apocalyptic number.

It is an amenable number.

20464993 is a deficient number, since it is larger than the sum of its proper divisors (14687).

20464993 is a wasteful number, since it uses less digits than its factorization.

20464993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14686.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 20464993 is about 4523.8250408255. The cubic root of 20464993 is about 273.5293080319.

The spelling of 20464993 in words is "twenty million, four hundred sixty-four thousand, nine hundred ninety-three".