20880071566 has 4 divisors (see below), whose sum is σ = 31320107352. Its totient is φ = 10440035782.

The previous prime is 20880071557. The next prime is 20880071581. The reversal of 20880071566 is 66517008802.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5220017890 + ... + 5220017893.

It is an arithmetic number, because the mean of its divisors is an integer number (7830026838).

Almost surely, 2^20880071566 is an apocalyptic number.

20880071566 is a deficient number, since it is larger than the sum of its proper divisors (10440035786).

20880071566 is a wasteful number, since it uses less digits than its factorization.

20880071566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10440035785.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 20880071566 in words is "twenty billion, eight hundred eighty million, seventy-one thousand, five hundred sixty-six".