20004634578 has 8 divisors (see below), whose sum is σ = 40009269168. Its totient is φ = 6668211524.

The previous prime is 20004634561. The next prime is 20004634579. The reversal of 20004634578 is 87543640002.

It is a happy number.

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

20004634578 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20004634579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667052876 + ... + 1667052887.

It is an arithmetic number, because the mean of its divisors is an integer number (5001158646).

Almost surely, 2^20004634578 is an apocalyptic number.

20004634578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20004634578 is a wasteful number, since it uses less digits than its factorization.

20004634578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334105768.

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 20004634578 in words is "twenty billion, four million, six hundred thirty-four thousand, five hundred seventy-eight".