20967729 has 8 divisors (see below), whose sum is σ = 28170912. Its totient is φ = 13871520.

The previous prime is 20967707. The next prime is 20967731. The reversal of 20967729 is 92776902.

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

It is not a de Polignac number, because 20967729 - 2⁸ = 20967473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20967799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26284 + ... + 27069.

It is an arithmetic number, because the mean of its divisors is an integer number (3521364).

Almost surely, 2^20967729 is an apocalyptic number.

It is an amenable number.

20967729 is a deficient number, since it is larger than the sum of its proper divisors (7203183).

20967729 is a wasteful number, since it uses less digits than its factorization.

20967729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53487.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 20967729 is about 4579.0532864338. The cubic root of 20967729 is about 275.7510225789.

The spelling of 20967729 in words is "twenty million, nine hundred sixty-seven thousand, seven hundred twenty-nine".