20761723 has 4 divisors (see below), whose sum is σ = 21431488. Its totient is φ = 20091960.

The previous prime is 20761721. The next prime is 20761739. The reversal of 20761723 is 32716702.

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

It is a cyclic number.

It is not a de Polignac number, because 20761723 - 2¹ = 20761721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20761691 and 20761700.

It is not an unprimeable number, because it can be changed into a prime (20761721) 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, 334836 + ... + 334897.

It is an arithmetic number, because the mean of its divisors is an integer number (5357872).

Almost surely, 2^20761723 is an apocalyptic number.

20761723 is a deficient number, since it is larger than the sum of its proper divisors (669765).

20761723 is an equidigital number, since it uses as much as digits as its factorization.

20761723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669764.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 20761723 is about 4556.5033742992. The cubic root of 20761723 is about 274.8449726771.

The spelling of 20761723 in words is "twenty million, seven hundred sixty-one thousand, seven hundred twenty-three".