20729166 has 8 divisors (see below), whose sum is σ = 41458344. Its totient is φ = 6909720.

The previous prime is 20729131. The next prime is 20729179. The reversal of 20729166 is 66192702.

It is a sphenic number, since it is the product of 3 distinct primes.

20729166 is an admirable number.

It is a congruent number.

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, 1727425 + ... + 1727436.

It is an arithmetic number, because the mean of its divisors is an integer number (5182293).

Almost surely, 2^20729166 is an apocalyptic number.

20729166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20729166 is a wasteful number, since it uses less digits than its factorization.

20729166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3454866.

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

The square root of 20729166 is about 4552.9293866696. The cubic root of 20729166 is about 274.7012336576.

The spelling of 20729166 in words is "twenty million, seven hundred twenty-nine thousand, one hundred sixty-six".