20826806416 has 40 divisors (see below), whose sum is σ = 44168351864. Its totient is φ = 9454786560.

The previous prime is 20826806389. The next prime is 20826806417. The reversal of 20826806416 is 61460862802.

It can be written as a sum of positive squares in 4 ways, for example, as 50466816 + 20776339600 = 7104^2 + 144140^2 .

It is not an unprimeable number, because it can be changed into a prime (20826806417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 808041 + ... + 833416.

Almost surely, 2^20826806416 is an apocalyptic number.

20826806416 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20826806416 is an abundant number, since it is smaller than the sum of its proper divisors (23341545448).

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

20826806416 is a wasteful number, since it uses less digits than its factorization.

20826806416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641539 (or 1641533 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 20826806416 in words is "twenty billion, eight hundred twenty-six million, eight hundred six thousand, four hundred sixteen".