20354978 has 8 divisors (see below), whose sum is σ = 34894272. Its totient is φ = 8723556.

The previous prime is 20354969. The next prime is 20354989. The reversal of 20354978 is 87945302.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726950 + ... + 726977.

It is an arithmetic number, because the mean of its divisors is an integer number (4361784).

Almost surely, 2^20354978 is an apocalyptic number.

20354978 is a deficient number, since it is larger than the sum of its proper divisors (14539294).

20354978 is a wasteful number, since it uses less digits than its factorization.

20354978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453936.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20354978 is about 4511.6491441600. The cubic root of 20354978 is about 273.0382839770.

The spelling of 20354978 in words is "twenty million, three hundred fifty-four thousand, nine hundred seventy-eight".