20729479 has 2 divisors, whose sum is σ = 20729480. Its totient is φ = 20729478.

The previous prime is 20729419. The next prime is 20729503. The reversal of 20729479 is 97492702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20729479 - 2⁷ = 20729351 is a prime.

It is a super-2 number, since 2×20729479² = 859422599222882, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20729419) 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 as a sum of consecutive naturals, namely, 10364739 + 10364740.

It is an arithmetic number, because the mean of its divisors is an integer number (10364740).

Almost surely, 2^20729479 is an apocalyptic number.

20729479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729479 is an equidigital number, since it uses as much as digits as its factorization.

20729479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 20729479 is about 4552.9637600139. The cubic root of 20729479 is about 274.7026162676.

The spelling of 20729479 in words is "twenty million, seven hundred twenty-nine thousand, four hundred seventy-nine".