129544020 has 36 divisors (see below), whose sum is σ = 392950740. Its totient is φ = 34545024.

The previous prime is 129544013. The next prime is 129544021. The reversal of 129544020 is 20445921.

It can be written as a sum of positive squares in 2 ways, for example, as 22297284 + 107246736 = 4722^2 + 10356^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129544021) 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, 359665 + ... + 360024.

Almost surely, 2^129544020 is an apocalyptic number.

129544020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129544020 is an abundant number, since it is smaller than the sum of its proper divisors (263406720).

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

129544020 is a wasteful number, since it uses less digits than its factorization.

129544020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719704 (or 719699 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 129544020 is about 11381.7406401657. The cubic root of 129544020 is about 505.9867254768.

Adding to 129544020 its reverse (20445921), we get a palindrome (149989941).

The spelling of 129544020 in words is "one hundred twenty-nine million, five hundred forty-four thousand, twenty".