20570978 has 8 divisors (see below), whose sum is σ = 30876240. Its totient is φ = 10278900.

The previous prime is 20570959. The next prime is 20570989. The reversal of 20570978 is 87907502.

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, 3053 + ... + 7103.

It is an arithmetic number, because the mean of its divisors is an integer number (3859530).

Almost surely, 2^20570978 is an apocalyptic number.

20570978 is a deficient number, since it is larger than the sum of its proper divisors (10305262).

20570978 is a wasteful number, since it uses less digits than its factorization.

20570978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6592.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 20570978 is about 4535.5240050076. The cubic root of 20570978 is about 274.0006837499. Note that the first 3 decimals are identical.

The spelling of 20570978 in words is "twenty million, five hundred seventy thousand, nine hundred seventy-eight".