20974279 has 8 divisors (see below), whose sum is σ = 21867120. Its totient is φ = 20092800.

The previous prime is 20974253. The next prime is 20974297. The reversal of 20974279 is 97247902.

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 20974279 - 2¹⁵ = 20941511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20974249) 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, 1039 + ... + 6559.

It is an arithmetic number, because the mean of its divisors is an integer number (2733390).

Almost surely, 2^20974279 is an apocalyptic number.

20974279 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20974279 is a deficient number, since it is larger than the sum of its proper divisors (892841).

20974279 is a wasteful number, since it uses less digits than its factorization.

20974279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5681.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 20974279 is about 4579.7684439281. The cubic root of 20974279 is about 275.7797330663.

The spelling of 20974279 in words is "twenty million, nine hundred seventy-four thousand, two hundred seventy-nine".