20729368 has 32 divisors (see below), whose sum is σ = 42831360. Its totient is φ = 9326880.

The previous prime is 20729351. The next prime is 20729369. The reversal of 20729368 is 86392702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20729369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7921 + ... + 10207.

It is an arithmetic number, because the mean of its divisors is an integer number (1338480).

Almost surely, 2^20729368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20729368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21415680).

20729368 is an abundant number, since it is smaller than the sum of its proper divisors (22101992).

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

20729368 is a wasteful number, since it uses less digits than its factorization.

20729368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407 (or 2403 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 20729368 is about 4552.9515701356. The cubic root of 20729368 is about 274.7021259506.

The spelling of 20729368 in words is "twenty million, seven hundred twenty-nine thousand, three hundred sixty-eight".