20704493 has 4 divisors (see below), whose sum is σ = 20828640. Its totient is φ = 20580348.

The previous prime is 20704469. The next prime is 20704499. The reversal of 20704493 is 39440702.

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 20704493 - 2¹⁸ = 20442349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20704499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61823 + ... + 62156.

It is an arithmetic number, because the mean of its divisors is an integer number (5207160).

Almost surely, 2^20704493 is an apocalyptic number.

It is an amenable number.

20704493 is a deficient number, since it is larger than the sum of its proper divisors (124147).

20704493 is a wasteful number, since it uses less digits than its factorization.

20704493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124146.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20704493 is about 4550.2190057183. The cubic root of 20704493 is about 274.5922021866.

The spelling of 20704493 in words is "twenty million, seven hundred four thousand, four hundred ninety-three".