29115920 has 20 divisors (see below), whose sum is σ = 67694700. Its totient is φ = 11646336.

The previous prime is 29115901. The next prime is 29115943. The reversal of 29115920 is 2951192.

It can be written as a sum of positive squares in 2 ways, for example, as 3268864 + 25847056 = 1808^2 + 5084^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181895 + ... + 182054.

It is an arithmetic number, because the mean of its divisors is an integer number (3384735).

Almost surely, 2^29115920 is an apocalyptic number.

29115920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29115920 is an abundant number, since it is smaller than the sum of its proper divisors (38578780).

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

29115920 is a wasteful number, since it uses less digits than its factorization.

29115920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363962 (or 363956 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 29115920 is about 5395.9169748987. The cubic root of 29115920 is about 307.6404980716.

The spelling of 29115920 in words is "twenty-nine million, one hundred fifteen thousand, nine hundred twenty".