20578057 has 8 divisors (see below), whose sum is σ = 21090816. Its totient is φ = 20068512.

The previous prime is 20578049. The next prime is 20578067. The reversal of 20578057 is 75087502.

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

It is a cyclic number.

It is not a de Polignac number, because 20578057 - 2³ = 20578049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20578027) 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, 16653 + ... + 17845.

It is an arithmetic number, because the mean of its divisors is an integer number (2636352).

Almost surely, 2^20578057 is an apocalyptic number.

It is an amenable number.

20578057 is a deficient number, since it is larger than the sum of its proper divisors (512759).

20578057 is a wasteful number, since it uses less digits than its factorization.

20578057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607.

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 20578057 is about 4536.3043328242. The cubic root of 20578057 is about 274.0321103612.

The spelling of 20578057 in words is "twenty million, five hundred seventy-eight thousand, fifty-seven".