20873374578 has 48 divisors (see below), whose sum is σ = 54406797120. Its totient is φ = 5649935328.

The previous prime is 20873374523. The next prime is 20873374607. The reversal of 20873374578 is 87547337802.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4357125 + ... + 4361912.

It is an arithmetic number, because the mean of its divisors is an integer number (1133474940).

Almost surely, 2^20873374578 is an apocalyptic number.

20873374578 is an abundant number, since it is smaller than the sum of its proper divisors (33533422542).

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

20873374578 is a wasteful number, since it uses less digits than its factorization.

20873374578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8719071 (or 8719068 counting only the distinct ones).

The product of its (nonzero) digits is 7902720, while the sum is 54.

The spelling of 20873374578 in words is "twenty billion, eight hundred seventy-three million, three hundred seventy-four thousand, five hundred seventy-eight".