20719393 has 4 divisors (see below), whose sum is σ = 20728708. Its totient is φ = 20710080.

The previous prime is 20719381. The next prime is 20719399. The reversal of 20719393 is 39391702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11916304 + 8803089 = 3452^2 + 2967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20719393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20719399) 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, 853 + ... + 6493.

It is an arithmetic number, because the mean of its divisors is an integer number (5182177).

Almost surely, 2^20719393 is an apocalyptic number.

It is an amenable number.

20719393 is a deficient number, since it is larger than the sum of its proper divisors (9315).

20719393 is an equidigital number, since it uses as much as digits as its factorization.

20719393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9314.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 20719393 is about 4551.8559950860. The cubic root of 20719393 is about 274.6580565359.

It can be divided in two parts, 20719 and 393, that added together give a palindrome (21112).

The spelling of 20719393 in words is "twenty million, seven hundred nineteen thousand, three hundred ninety-three".