20578990 has 16 divisors (see below), whose sum is σ = 37200240. Its totient is φ = 8196480.

The previous prime is 20578981. The next prime is 20579047. The reversal of 20578990 is 9987502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1860 + ... + 6679.

It is an arithmetic number, because the mean of its divisors is an integer number (2325015).

Almost surely, 2^20578990 is an apocalyptic number.

20578990 is a deficient number, since it is larger than the sum of its proper divisors (16621250).

20578990 is a wasteful number, since it uses less digits than its factorization.

20578990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8787.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 20578990 is about 4536.4071686743. The cubic root of 20578990 is about 274.0362517968.

The spelling of 20578990 in words is "twenty million, five hundred seventy-eight thousand, nine hundred ninety".