20729080 has 64 divisors (see below), whose sum is σ = 49017600. Its totient is φ = 7879680.

The previous prime is 20729077. The next prime is 20729087. The reversal of 20729080 is 8092702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20729087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90406 + ... + 90634.

It is an arithmetic number, because the mean of its divisors is an integer number (765900).

Almost surely, 2^20729080 is an apocalyptic number.

20729080 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 20729080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24508800).

20729080 is an abundant number, since it is smaller than the sum of its proper divisors (28288520).

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

20729080 is a wasteful number, since it uses less digits than its factorization.

20729080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 20729080 is about 4552.9199421909. The cubic root of 20729080 is about 274.7008537687.

The spelling of 20729080 in words is "twenty million, seven hundred twenty-nine thousand, eighty".