20795729 has 8 divisors (see below), whose sum is σ = 21275592. Its totient is φ = 20321280.

The previous prime is 20795717. The next prime is 20795759. The reversal of 20795729 is 92759702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1567504 + 19228225 = 1252^2 + 4385^2 .

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 20795729 - 2²⁰ = 19747153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20795759) 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, 6989 + ... + 9509.

It is an arithmetic number, because the mean of its divisors is an integer number (2659449).

Almost surely, 2^20795729 is an apocalyptic number.

It is an amenable number.

20795729 is a deficient number, since it is larger than the sum of its proper divisors (479863).

20795729 is a wasteful number, since it uses less digits than its factorization.

20795729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2707.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 20795729 is about 4560.2334370074. The cubic root of 20795729 is about 274.9949486675.

The spelling of 20795729 in words is "twenty million, seven hundred ninety-five thousand, seven hundred twenty-nine".