20087779860 has 36 divisors (see below), whose sum is σ = 60932932788. Its totient is φ = 5356741248.

The previous prime is 20087779843. The next prime is 20087779871. The reversal of 20087779860 is 6897778002.

It can be written as a sum of positive squares in 2 ways, for example, as 3817756944 + 16270022916 = 61788^2 + 127554^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 20087779797 and 20087779806.

It is a congruent number.

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, 55799209 + ... + 55799568.

Almost surely, 2^20087779860 is an apocalyptic number.

20087779860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20087779860 is an abundant number, since it is smaller than the sum of its proper divisors (40845152928).

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

20087779860 is a wasteful number, since it uses less digits than its factorization.

20087779860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111598792 (or 111598787 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 20087779860 in words is "twenty billion, eighty-seven million, seven hundred seventy-nine thousand, eight hundred sixty".