20292729 has 8 divisors (see below), whose sum is σ = 27144672. Its totient is φ = 13484640.

The previous prime is 20292719. The next prime is 20292731. The reversal of 20292729 is 92729202.

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

It is not a de Polignac number, because 20292729 - 2⁵ = 20292697 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20292729.

It is not an unprimeable number, because it can be changed into a prime (20292719) 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 7 ways as a sum of consecutive naturals, for example, 9867 + ... + 11744.

It is an arithmetic number, because the mean of its divisors is an integer number (3393084).

Almost surely, 2^20292729 is an apocalyptic number.

It is an amenable number.

20292729 is a deficient number, since it is larger than the sum of its proper divisors (6851943).

20292729 is a wasteful number, since it uses less digits than its factorization.

20292729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21927.

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

The square root of 20292729 is about 4504.7451648234. The cubic root of 20292729 is about 272.7596671924.

The spelling of 20292729 in words is "twenty million, two hundred ninety-two thousand, seven hundred twenty-nine".