20531723 has 8 divisors (see below), whose sum is σ = 22021200. Its totient is φ = 19083168.

The previous prime is 20531717. The next prime is 20531741. The reversal of 20531723 is 32713502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20531723 - 2⁶ = 20531659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531713) 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 7 ways as a sum of consecutive naturals, for example, 9188 + ... + 11201.

It is an arithmetic number, because the mean of its divisors is an integer number (2752650).

Almost surely, 2^20531723 is an apocalyptic number.

20531723 is a deficient number, since it is larger than the sum of its proper divisors (1489477).

20531723 is a wasteful number, since it uses less digits than its factorization.

20531723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20461.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20531723 is about 4531.1944341421. The cubic root of 20531723 is about 273.8262835856.

It can be divided in two parts, 2053172 and 3, that multiplied together give a palindrome (6159516).

The spelling of 20531723 in words is "twenty million, five hundred thirty-one thousand, seven hundred twenty-three".