29921920 has 64 divisors (see below), whose sum is σ = 81763200. Its totient is φ = 10257408.

The previous prime is 29921911. The next prime is 29921933. The reversal of 29921920 is 2912992.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1141 + ... + 7819.

It is an arithmetic number, because the mean of its divisors is an integer number (1277550).

Almost surely, 2^29921920 is an apocalyptic number.

29921920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 29921920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40881600).

29921920 is an abundant number, since it is smaller than the sum of its proper divisors (51841280).

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

29921920 is an equidigital number, since it uses as much as digits as its factorization.

29921920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6705 (or 6693 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 29921920 is about 5470.0932350372. The cubic root of 29921920 is about 310.4534467077.

The spelling of 29921920 in words is "twenty-nine million, nine hundred twenty-one thousand, nine hundred twenty".