20879723 has 4 divisors (see below), whose sum is σ = 22107960. Its totient is φ = 19651488.

The previous prime is 20879717. The next prime is 20879741. The reversal of 20879723 is 32797802.

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 20879723 - 2⁴ = 20879707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20879753) 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, 614093 + ... + 614126.

It is an arithmetic number, because the mean of its divisors is an integer number (5526990).

Almost surely, 2^20879723 is an apocalyptic number.

20879723 is a deficient number, since it is larger than the sum of its proper divisors (1228237).

20879723 is a wasteful number, since it uses less digits than its factorization.

20879723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228236.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 20879723 is about 4569.4335535162. The cubic root of 20879723 is about 275.3646864117.

The spelling of 20879723 in words is "twenty million, eight hundred seventy-nine thousand, seven hundred twenty-three".