129345020 has 48 divisors (see below), whose sum is σ = 320452608. Its totient is φ = 42914880.

The previous prime is 129345011. The next prime is 129345043. The reversal of 129345020 is 20543921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10562 + ... + 19241.

It is an arithmetic number, because the mean of its divisors is an integer number (6676096).

Almost surely, 2^129345020 is an apocalyptic number.

129345020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129345020 is an abundant number, since it is smaller than the sum of its proper divisors (191107588).

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

129345020 is a wasteful number, since it uses less digits than its factorization.

129345020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29850 (or 29848 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 129345020 is about 11372.9952079476. The cubic root of 129345020 is about 505.7275009504.

Adding to 129345020 its reverse (20543921), we get a palindrome (149888941).

The spelling of 129345020 in words is "one hundred twenty-nine million, three hundred forty-five thousand, twenty".