20887756476 has 48 divisors (see below), whose sum is σ = 52958223360. Its totient is φ = 6383352960.

The previous prime is 20887756471. The next prime is 20887756517. The reversal of 20887756476 is 67465778802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887756471) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 1470561 + ... + 1484696.

It is an arithmetic number, because the mean of its divisors is an integer number (1103296320).

Almost surely, 2^20887756476 is an apocalyptic number.

It is an amenable number.

20887756476 is an abundant number, since it is smaller than the sum of its proper divisors (32070466884).

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

20887756476 is a wasteful number, since it uses less digits than its factorization.

20887756476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2955314 (or 2955312 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 60.

The spelling of 20887756476 in words is "twenty billion, eight hundred eighty-seven million, seven hundred fifty-six thousand, four hundred seventy-six".