129948020 has 18 divisors (see below), whose sum is σ = 272997942. Its totient is φ = 51958816.

The previous prime is 129948019. The next prime is 129948029. The reversal of 129948020 is 20849921.

It can be written as a sum of positive squares in 3 ways, for example, as 70627216 + 59320804 = 8404^2 + 7702^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129948029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49706 + ... + 52254.

Almost surely, 2^129948020 is an apocalyptic number.

129948020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129948020 is an abundant number, since it is smaller than the sum of its proper divisors (143049922).

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

129948020 is an frugal number, since it uses more digits than its factorization.

129948020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5107 (or 2556 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 129948020 is about 11399.4745492939. The cubic root of 129948020 is about 506.5121749273.

The spelling of 129948020 in words is "one hundred twenty-nine million, nine hundred forty-eight thousand, twenty".