20729351 has 2 divisors, whose sum is σ = 20729352. Its totient is φ = 20729350.

The previous prime is 20729339. The next prime is 20729369. The reversal of 20729351 is 15392702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20729351 - 2²² = 16535047 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20729381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10364675 + 10364676.

It is an arithmetic number, because the mean of its divisors is an integer number (10364676).

Almost surely, 2^20729351 is an apocalyptic number.

20729351 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729351 is an equidigital number, since it uses as much as digits as its factorization.

20729351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20729351 is about 4552.9497032144. The cubic root of 20729351 is about 274.7020508569.

The spelling of 20729351 in words is "twenty million, seven hundred twenty-nine thousand, three hundred fifty-one".