20134523656 has 64 divisors (see below), whose sum is σ = 42521915520. Its totient is φ = 8868288000.

The previous prime is 20134523639. The next prime is 20134523659. The reversal of 20134523656 is 65632543102.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20134523659) 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, 1050156 + ... + 1069156.

It is an arithmetic number, because the mean of its divisors is an integer number (664404930).

Almost surely, 2^20134523656 is an apocalyptic number.

20134523656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20134523656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21260957760).

20134523656 is an abundant number, since it is smaller than the sum of its proper divisors (22387391864).

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

20134523656 is a wasteful number, since it uses less digits than its factorization.

20134523656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19486 (or 19482 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 20134523656 in words is "twenty billion, one hundred thirty-four million, five hundred twenty-three thousand, six hundred fifty-six".