20154256136 has 64 divisors (see below), whose sum is σ = 43560720000. Its totient is φ = 8563161600.

The previous prime is 20154256123. The next prime is 20154256139. The reversal of 20154256136 is 63165245102.

It is a junction number, because it is equal to n+sod(n) for n = 20154256096 and 20154256105.

It is not an unprimeable number, because it can be changed into a prime (20154256139) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5012735 + ... + 5016753.

It is an arithmetic number, because the mean of its divisors is an integer number (680636250).

Almost surely, 2^20154256136 is an apocalyptic number.

It is an amenable number.

20154256136 is an abundant number, since it is smaller than the sum of its proper divisors (23406463864).

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

20154256136 is a wasteful number, since it uses less digits than its factorization.

20154256136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782 (or 4778 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 20154256136 in words is "twenty billion, one hundred fifty-four million, two hundred fifty-six thousand, one hundred thirty-six".