20099776878 has 12 divisors (see below), whose sum is σ = 43549516608. Its totient is φ = 6699925620.

The previous prime is 20099776877. The next prime is 20099776891. The reversal of 20099776878 is 87867799002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20099776877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 558327118 + ... + 558327153.

It is an arithmetic number, because the mean of its divisors is an integer number (3629126384).

Almost surely, 2^20099776878 is an apocalyptic number.

20099776878 is an abundant number, since it is smaller than the sum of its proper divisors (23449739730).

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

20099776878 is a wasteful number, since it uses less digits than its factorization.

20099776878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116654279 (or 1116654276 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 63.

The spelling of 20099776878 in words is "twenty billion, ninety-nine million, seven hundred seventy-six thousand, eight hundred seventy-eight".