20955979 has 8 divisors (see below), whose sum is σ = 22966272. Its totient is φ = 18963240.

The previous prime is 20955973. The next prime is 20955989. The reversal of 20955979 is 97955902.

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

It is a cyclic number.

It is not a de Polignac number, because 20955979 - 2³ = 20955971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20955971) 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, 1819 + ... + 6724.

It is an arithmetic number, because the mean of its divisors is an integer number (2870784).

Almost surely, 2^20955979 is an apocalyptic number.

20955979 is a deficient number, since it is larger than the sum of its proper divisors (2010293).

20955979 is a wasteful number, since it uses less digits than its factorization.

20955979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8777.

The product of its (nonzero) digits is 255150, while the sum is 46.

The square root of 20955979 is about 4577.7700903387. The cubic root of 20955979 is about 275.6995040456.

It can be divided in two parts, 209 and 55979, that multiplied together give a palindrome (11699611).

The spelling of 20955979 in words is "twenty million, nine hundred fifty-five thousand, nine hundred seventy-nine".