20525978 has 8 divisors (see below), whose sum is σ = 33588000. Its totient is φ = 9329980.

The previous prime is 20525971. The next prime is 20526031. The reversal of 20525978 is 87952502.

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

It is not an unprimeable number, because it can be changed into a prime (20525971) by changing a digit.

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, 466478 + ... + 466521.

It is an arithmetic number, because the mean of its divisors is an integer number (4198500).

Almost surely, 2^20525978 is an apocalyptic number.

20525978 is a deficient number, since it is larger than the sum of its proper divisors (13062022).

20525978 is a wasteful number, since it uses less digits than its factorization.

20525978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933012.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 20525978 is about 4530.5604509818. The cubic root of 20525978 is about 273.8007413431.

The spelling of 20525978 in words is "twenty million, five hundred twenty-five thousand, nine hundred seventy-eight".