20880638942 has 4 divisors (see below), whose sum is σ = 31320958416. Its totient is φ = 10440319470.

The previous prime is 20880638897. The next prime is 20880638983. The reversal of 20880638942 is 24983608802.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5220159734 + ... + 5220159737.

It is an arithmetic number, because the mean of its divisors is an integer number (7830239604).

Almost surely, 2^20880638942 is an apocalyptic number.

20880638942 is a deficient number, since it is larger than the sum of its proper divisors (10440319474).

20880638942 is a wasteful number, since it uses less digits than its factorization.

20880638942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10440319473.

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 20880638942 in words is "twenty billion, eight hundred eighty million, six hundred thirty-eight thousand, nine hundred forty-two".