20943879 has 32 divisors (see below), whose sum is σ = 32071680. Its totient is φ = 12040800.

The previous prime is 20943863. The next prime is 20943883. The reversal of 20943879 is 97834902.

It is not a de Polignac number, because 20943879 - 2⁴ = 20943863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20943879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20943889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60184 + ... + 60530.

It is an arithmetic number, because the mean of its divisors is an integer number (1002240).

Almost surely, 2^20943879 is an apocalyptic number.

20943879 is a deficient number, since it is larger than the sum of its proper divisors (11127801).

20943879 is a wasteful number, since it uses less digits than its factorization.

20943879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 20943879 is about 4576.4482953487. The cubic root of 20943879 is about 275.6464307872.

The spelling of 20943879 in words is "twenty million, nine hundred forty-three thousand, eight hundred seventy-nine".