20528638736 has 40 divisors (see below), whose sum is σ = 40008343320. Its totient is φ = 10203992064.

The previous prime is 20528638733. The next prime is 20528638769. The reversal of 20528638736 is 63783682502.

It can be written as a sum of positive squares in 4 ways, for example, as 10617241600 + 9911397136 = 103040^2 + 99556^2 .

It is not an unprimeable number, because it can be changed into a prime (20528638733) 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, 6355970 + ... + 6359198.

It is an arithmetic number, because the mean of its divisors is an integer number (1000208583).

Almost surely, 2^20528638736 is an apocalyptic number.

It is an amenable number.

20528638736 is a deficient number, since it is larger than the sum of its proper divisors (19479704584).

20528638736 is a wasteful number, since it uses less digits than its factorization.

20528638736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5451 (or 5445 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 20528638736 in words is "twenty billion, five hundred twenty-eight million, six hundred thirty-eight thousand, seven hundred thirty-six".