20729293 has 8 divisors (see below), whose sum is σ = 22530200. Its totient is φ = 18957888.

The previous prime is 20729281. The next prime is 20729329. The reversal of 20729293 is 39292702.

It can be written as a sum of positive squares in 4 ways, for example, as 316969 + 20412324 = 563^2 + 4518^2 .

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 20729293 - 2⁹ = 20728781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20729243) 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, 5898 + ... + 8731.

It is an arithmetic number, because the mean of its divisors is an integer number (2816275).

Almost surely, 2^20729293 is an apocalyptic number.

It is an amenable number.

20729293 is a deficient number, since it is larger than the sum of its proper divisors (1800907).

20729293 is a wasteful number, since it uses less digits than its factorization.

20729293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14751.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20729293 is about 4552.9433337128. The cubic root of 20729293 is about 274.7017946544.

The spelling of 20729293 in words is "twenty million, seven hundred twenty-nine thousand, two hundred ninety-three".