20440165723 has 2 divisors, whose sum is σ = 20440165724. Its totient is φ = 20440165722.

The previous prime is 20440165709. The next prime is 20440165751. The reversal of 20440165723 is 32756104402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20440165723 - 2¹³ = 20440157531 is a prime.

It is a super-2 number, since 2×20440165723² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20440165703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220082861 + 10220082862.

It is an arithmetic number, because the mean of its divisors is an integer number (10220082862).

Almost surely, 2^20440165723 is an apocalyptic number.

20440165723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440165723 is an equidigital number, since it uses as much as digits as its factorization.

20440165723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 20440165723 in words is "twenty billion, four hundred forty million, one hundred sixty-five thousand, seven hundred twenty-three".