20000331978 has 32 divisors (see below), whose sum is σ = 43644000960. Its totient is φ = 6059746560.

The previous prime is 20000331941. The next prime is 20000331979. The reversal of 20000331978 is 87913300002.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20000331979) 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, 473218 + ... + 513746.

It is an arithmetic number, because the mean of its divisors is an integer number (1363875030).

Almost surely, 2^20000331978 is an apocalyptic number.

20000331978 is an abundant number, since it is smaller than the sum of its proper divisors (23643668982).

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

20000331978 is a wasteful number, since it uses less digits than its factorization.

20000331978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48022.

The product of its (nonzero) digits is 9072, while the sum is 33.

The spelling of 20000331978 in words is "twenty billion, three hundred thirty-one thousand, nine hundred seventy-eight".