20256961136 has 10 divisors (see below), whose sum is σ = 39247862232. Its totient is φ = 10128480560.

The previous prime is 20256961103. The next prime is 20256961139. The reversal of 20256961136 is 63116965202.

It is a junction number, because it is equal to n+sod(n) for n = 20256961093 and 20256961102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256961139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633030020 + ... + 633030051.

Almost surely, 2^20256961136 is an apocalyptic number.

It is an amenable number.

20256961136 is a deficient number, since it is larger than the sum of its proper divisors (18990901096).

20256961136 is a wasteful number, since it uses less digits than its factorization.

20256961136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266060079 (or 1266060073 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 20256961136 in words is "twenty billion, two hundred fifty-six million, nine hundred sixty-one thousand, one hundred thirty-six".