20729292 has 12 divisors (see below), whose sum is σ = 48368376. Its totient is φ = 6909760.

The previous prime is 20729281. The next prime is 20729329. The reversal of 20729292 is 29292702.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 863709 + ... + 863732.

It is an arithmetic number, because the mean of its divisors is an integer number (4030698).

Almost surely, 2^20729292 is an apocalyptic number.

It is an amenable number.

20729292 is an abundant number, since it is smaller than the sum of its proper divisors (27639084).

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

20729292 is a wasteful number, since it uses less digits than its factorization.

20729292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727448 (or 1727446 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20729292 is about 4552.9432238937. The cubic root of 20729292 is about 274.7017902371.

The spelling of 20729292 in words is "twenty million, seven hundred twenty-nine thousand, two hundred ninety-two".