20855976829 has 6 divisors (see below), whose sum is σ = 22011432990. Its totient is φ = 19758293496.

The previous prime is 20855976821. The next prime is 20855976923. The reversal of 20855976829 is 92867955802.

It can be written as a sum of positive squares in only one way, i.e., 14024954329 + 6831022500 = 118427^2 + 82650^2 .

It is not a de Polignac number, because 20855976829 - 2³ = 20855976821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855976821) 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, 28886034 + ... + 28886755.

It is an arithmetic number, because the mean of its divisors is an integer number (3668572165).

Almost surely, 2^20855976829 is an apocalyptic number.

It is an amenable number.

20855976829 is a deficient number, since it is larger than the sum of its proper divisors (1155456161).

20855976829 is an equidigital number, since it uses as much as digits as its factorization.

20855976829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57772827 (or 57772808 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 61.

The spelling of 20855976829 in words is "twenty billion, eight hundred fifty-five million, nine hundred seventy-six thousand, eight hundred twenty-nine".