20974359 has 8 divisors (see below), whose sum is σ = 31960960. Its totient is φ = 11985336.

The previous prime is 20974357. The next prime is 20974381. The reversal of 20974359 is 95347902.

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

It is not a de Polignac number, because 20974359 - 2¹ = 20974357 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 (20974357) 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, 499369 + ... + 499410.

It is an arithmetic number, because the mean of its divisors is an integer number (3995120).

Almost surely, 2^20974359 is an apocalyptic number.

20974359 is a deficient number, since it is larger than the sum of its proper divisors (10986601).

20974359 is an equidigital number, since it uses as much as digits as its factorization.

20974359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998789.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 20974359 is about 4579.7771779858. Note that the first 3 decimals coincide. The cubic root of 20974359 is about 275.7800836918.

The spelling of 20974359 in words is "twenty million, nine hundred seventy-four thousand, three hundred fifty-nine".