20772723 has 4 divisors (see below), whose sum is σ = 27696968. Its totient is φ = 13848480.

The previous prime is 20772709. The next prime is 20772751. The reversal of 20772723 is 32727702.

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

It is not a de Polignac number, because 20772723 - 2⁴ = 20772707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20772923) 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, 3462118 + ... + 3462123.

It is an arithmetic number, because the mean of its divisors is an integer number (6924242).

Almost surely, 2^20772723 is an apocalyptic number.

20772723 is a deficient number, since it is larger than the sum of its proper divisors (6924245).

20772723 is an equidigital number, since it uses as much as digits as its factorization.

20772723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6924244.

The product of its (nonzero) digits is 8232, while the sum is 30.

The square root of 20772723 is about 4557.7102803930. The cubic root of 20772723 is about 274.8935036672.

The spelling of 20772723 in words is "twenty million, seven hundred seventy-two thousand, seven hundred twenty-three".