20826979 has 8 divisors (see below), whose sum is σ = 21170160. Its totient is φ = 20486400.

The previous prime is 20826961. The next prime is 20827003. The reversal of 20826979 is 97962802.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20826979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20826919) 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, 20964 + ... + 21934.

It is an arithmetic number, because the mean of its divisors is an integer number (2646270).

Almost surely, 2^20826979 is an apocalyptic number.

20826979 is a deficient number, since it is larger than the sum of its proper divisors (343181).

20826979 is an equidigital number, since it uses as much as digits as its factorization.

20826979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 20826979 is about 4563.6585104497. The cubic root of 20826979 is about 275.1326258347.

The spelling of 20826979 in words is "twenty million, eight hundred twenty-six thousand, nine hundred seventy-nine".