20729419 has 2 divisors, whose sum is σ = 20729420. Its totient is φ = 20729418.

The previous prime is 20729407. The next prime is 20729479. The reversal of 20729419 is 91492702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20729419 - 2⁹ = 20728907 is a prime.

It is a super-2 number, since 2×20729419² = 859417624155122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20729479) 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, 10364709 + 10364710.

It is an arithmetic number, because the mean of its divisors is an integer number (10364710).

Almost surely, 2^20729419 is an apocalyptic number.

20729419 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729419 is an equidigital number, since it uses as much as digits as its factorization.

20729419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 20729419 is about 4552.9571708945. The cubic root of 20729419 is about 274.7023512316.

The spelling of 20729419 in words is "twenty million, seven hundred twenty-nine thousand, four hundred nineteen".