1720724023 has 4 divisors (see below), whose sum is σ = 1753190568. Its totient is φ = 1688257480.

The previous prime is 1720724009. The next prime is 1720724029. The reversal of 1720724023 is 3204270271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720724023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1720723982 and 1720724000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720724029) 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, 16233193 + ... + 16233298.

It is an arithmetic number, because the mean of its divisors is an integer number (438297642).

Almost surely, 2^1720724023 is an apocalyptic number.

1720724023 is a deficient number, since it is larger than the sum of its proper divisors (32466545).

1720724023 is an equidigital number, since it uses as much as digits as its factorization.

1720724023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32466544.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 1720724023 is about 41481.6106606289. The cubic root of 1720724023 is about 1198.3133765934.

Adding to 1720724023 its reverse (3204270271), we get a palindrome (4924994294).

The spelling of 1720724023 in words is "one billion, seven hundred twenty million, seven hundred twenty-four thousand, twenty-three".