20129238864 has 60 divisors (see below), whose sum is σ = 64381616416. Its totient is φ = 5751210816.

The previous prime is 20129238863. The next prime is 20129238893. The reversal of 20129238864 is 46883292102.

20129238864 is a `hidden beast` number, since 201 + 2 + 9 + 2 + 388 + 64 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129238863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9983734 + ... + 9985749.

Almost surely, 2^20129238864 is an apocalyptic number.

20129238864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20129238864 is an abundant number, since it is smaller than the sum of its proper divisors (44252377552).

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

20129238864 is a wasteful number, since it uses less digits than its factorization.

20129238864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19969504 (or 19969495 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 20129238864 in words is "twenty billion, one hundred twenty-nine million, two hundred thirty-eight thousand, eight hundred sixty-four".