20636996756 has 36 divisors (see below), whose sum is σ = 38137406580. Its totient is φ = 9769818240.

The previous prime is 20636996747. The next prime is 20636996771. The reversal of 20636996756 is 65769963602.

It can be written as a sum of positive squares in 2 ways, for example, as 1473024400 + 19163972356 = 38380^2 + 138434^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20636996695 and 20636996704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3637490 + ... + 3643158.

It is an arithmetic number, because the mean of its divisors is an integer number (1059372405).

Almost surely, 2^20636996756 is an apocalyptic number.

It is an amenable number.

20636996756 is a deficient number, since it is larger than the sum of its proper divisors (17500409824).

20636996756 is a wasteful number, since it uses less digits than its factorization.

20636996756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8232 (or 8211 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 59.

The spelling of 20636996756 in words is "twenty billion, six hundred thirty-six million, nine hundred ninety-six thousand, seven hundred fifty-six".