20635256536 has 16 divisors (see below), whose sum is σ = 39236052240. Its totient is φ = 10172309280.

The previous prime is 20635256497. The next prime is 20635256561. The reversal of 20635256536 is 63565253602.

It is a junction number, because it is equal to n+sod(n) for n = 20635256492 and 20635256501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18164271 + ... + 18165406.

It is an arithmetic number, because the mean of its divisors is an integer number (2452253265).

Almost surely, 2^20635256536 is an apocalyptic number.

It is an amenable number.

20635256536 is a deficient number, since it is larger than the sum of its proper divisors (18600795704).

20635256536 is a wasteful number, since it uses less digits than its factorization.

20635256536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36329754 (or 36329750 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 43.

The spelling of 20635256536 in words is "twenty billion, six hundred thirty-five million, two hundred fifty-six thousand, five hundred thirty-six".