20578008 has 64 divisors (see below), whose sum is σ = 58579200. Its totient is φ = 5962880.

The previous prime is 20577979. The next prime is 20578009. The reversal of 20578008 is 80087502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20578009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4378 + ... + 7766.

It is an arithmetic number, because the mean of its divisors is an integer number (915300).

Almost surely, 2^20578008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20578008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29289600).

20578008 is an abundant number, since it is smaller than the sum of its proper divisors (38001192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20578008 is a wasteful number, since it uses less digits than its factorization.

20578008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432 (or 3428 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 20578008 is about 4536.2989319488. The cubic root of 20578008 is about 274.0318928546.

The spelling of 20578008 in words is "twenty million, five hundred seventy-eight thousand, eight".