20879331 has 16 divisors (see below), whose sum is σ = 31691520. Its totient is φ = 12103520.

The previous prime is 20879321. The next prime is 20879351. The reversal of 20879331 is 13397802.

It is not a de Polignac number, because 20879331 - 2⁷ = 20879203 is a prime.

It is a super-2 number, since 2×20879331² = 871892926015122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 20879292 and 20879301.

It is not an unprimeable number, because it can be changed into a prime (20879321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12996 + ... + 14513.

It is an arithmetic number, because the mean of its divisors is an integer number (1980720).

Almost surely, 2^20879331 is an apocalyptic number.

20879331 is a deficient number, since it is larger than the sum of its proper divisors (10812189).

20879331 is a wasteful number, since it uses less digits than its factorization.

20879331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27546.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20879331 is about 4569.3906595957. The cubic root of 20879331 is about 275.3629631508.

The spelling of 20879331 in words is "twenty million, eight hundred seventy-nine thousand, three hundred thirty-one".