20774585936 has 70 divisors (see below), whose sum is σ = 43767089910. Its totient is φ = 9552626304.

The previous prime is 20774585911. The next prime is 20774585981. The reversal of 20774585936 is 63958547702.

It can be written as a sum of positive squares in 7 ways, for example, as 5285290000 + 15489295936 = 72700^2 + 124456^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 77228810 + ... + 77229078.

Almost surely, 2^20774585936 is an apocalyptic number.

20774585936 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20774585936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21883544955).

20774585936 is an abundant number, since it is smaller than the sum of its proper divisors (22992503974).

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

20774585936 is an frugal number, since it uses more digits than its factorization.

20774585936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 56.

The spelling of 20774585936 in words is "twenty billion, seven hundred seventy-four million, five hundred eighty-five thousand, nine hundred thirty-six".