129163020 has 72 divisors (see below), whose sum is σ = 420711984. Its totient is φ = 29522304.

The previous prime is 129162989. The next prime is 129163033. The reversal of 129163020 is 20361921.

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, 19027 + ... + 24906.

It is an arithmetic number, because the mean of its divisors is an integer number (5843222).

Almost surely, 2^129163020 is an apocalyptic number.

129163020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129163020 is an abundant number, since it is smaller than the sum of its proper divisors (291548964).

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

129163020 is a wasteful number, since it uses less digits than its factorization.

129163020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43959 (or 43950 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 129163020 is about 11364.9909810787. The cubic root of 129163020 is about 505.4901883489.

The spelling of 129163020 in words is "one hundred twenty-nine million, one hundred sixty-three thousand, twenty".