20129534700 has 72 divisors (see below), whose sum is σ = 63536141760. Its totient is φ = 4879886400.

The previous prime is 20129534669. The next prime is 20129534773. The reversal of 20129534700 is 743592102.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3046630 + ... + 3053229.

Almost surely, 2^20129534700 is an apocalyptic number.

20129534700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20129534700 is an abundant number, since it is smaller than the sum of its proper divisors (43406607060).

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

20129534700 is a wasteful number, since it uses less digits than its factorization.

20129534700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6099887 (or 6099880 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The spelling of 20129534700 in words is "twenty billion, one hundred twenty-nine million, five hundred thirty-four thousand, seven hundred".