20579999994 has 24 divisors (see below), whose sum is σ = 46241482560. Its totient is φ = 6859999836.

The previous prime is 20579999987. The next prime is 20580000083. The reversal of 20579999994 is 49999997502.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21172354 + ... + 21173325.

It is an arithmetic number, because the mean of its divisors is an integer number (1926728440).

Almost surely, 2^20579999994 is an apocalyptic number.

20579999994 is an abundant number, since it is smaller than the sum of its proper divisors (25661482566).

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

20579999994 is an equidigital number, since it uses as much as digits as its factorization.

20579999994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42345696 (or 42345684 counting only the distinct ones).

The product of its (nonzero) digits is 148803480, while the sum is 72.

The spelling of 20579999994 in words is "twenty billion, five hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred ninety-four".