20729433 has 8 divisors (see below), whose sum is σ = 27720288. Its totient is φ = 13779104.

The previous prime is 20729419. The next prime is 20729479. The reversal of 20729433 is 33492702.

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

It is a cyclic number.

It is not a de Polignac number, because 20729433 - 2⁶ = 20729369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20729433.

It is not an unprimeable number, because it can be changed into a prime (20729633) 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, 8916 + ... + 10997.

It is an arithmetic number, because the mean of its divisors is an integer number (3465036).

Almost surely, 2^20729433 is an apocalyptic number.

It is an amenable number.

20729433 is a deficient number, since it is larger than the sum of its proper divisors (6990855).

20729433 is a wasteful number, since it uses less digits than its factorization.

20729433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20263.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 20729433 is about 4552.9587083566. The cubic root of 20729433 is about 274.7024130734.

The spelling of 20729433 in words is "twenty million, seven hundred twenty-nine thousand, four hundred thirty-three".