20871723 has 8 divisors (see below), whose sum is σ = 27864208. Its totient is φ = 13896864.

The previous prime is 20871707. The next prime is 20871731. The reversal of 20871723 is 32717802.

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

It is not a de Polignac number, because 20871723 - 2⁴ = 20871707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20871743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1336 + ... + 6597.

It is an arithmetic number, because the mean of its divisors is an integer number (3483026).

Almost surely, 2^20871723 is an apocalyptic number.

20871723 is a deficient number, since it is larger than the sum of its proper divisors (6992485).

20871723 is an equidigital number, since it uses as much as digits as its factorization.

20871723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8813.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 20871723 is about 4568.5580876246. The cubic root of 20871723 is about 275.3295135489.

The spelling of 20871723 in words is "twenty million, eight hundred seventy-one thousand, seven hundred twenty-three".