20879349 has 16 divisors (see below), whose sum is σ = 29745792. Its totient is φ = 12981248.

The previous prime is 20879321. The next prime is 20879351. The reversal of 20879349 is 94397802.

It is a cyclic number.

It is not a de Polignac number, because 20879349 - 2⁵ = 20879317 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20879349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20879389) 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 15 ways as a sum of consecutive naturals, for example, 3952 + ... + 7574.

It is an arithmetic number, because the mean of its divisors is an integer number (1859112).

Almost surely, 2^20879349 is an apocalyptic number.

It is an amenable number.

20879349 is a deficient number, since it is larger than the sum of its proper divisors (8866443).

20879349 is a wasteful number, since it uses less digits than its factorization.

20879349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3756.

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

The square root of 20879349 is about 4569.3926292233. The cubic root of 20879349 is about 275.3630422806.

The spelling of 20879349 in words is "twenty million, eight hundred seventy-nine thousand, three hundred forty-nine".