20958974 has 8 divisors (see below), whose sum is σ = 32169720. Its totient is φ = 10235736.

The previous prime is 20958961. The next prime is 20958979. The reversal of 20958974 is 47985902.

It is a happy number.

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

It is a super-2 number, since 2×20958974² = 878557182265352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20958979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121769 + ... + 121940.

It is an arithmetic number, because the mean of its divisors is an integer number (4021215).

Almost surely, 2^20958974 is an apocalyptic number.

20958974 is a deficient number, since it is larger than the sum of its proper divisors (11210746).

20958974 is a wasteful number, since it uses less digits than its factorization.

20958974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243754.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 20958974 is about 4578.0972029873. The cubic root of 20958974 is about 275.7126376193.

The spelling of 20958974 in words is "twenty million, nine hundred fifty-eight thousand, nine hundred seventy-four".