20619329 has 2 divisors, whose sum is σ = 20619330. Its totient is φ = 20619328.

The previous prime is 20619307. The next prime is 20619331. The reversal of 20619329 is 92391602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12439729 + 8179600 = 3527^2 + 2860^2 .

It is a cyclic number.

It is not a de Polignac number, because 20619329 - 2⁸ = 20619073 is a prime.

Together with 20619331, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20619295 and 20619304.

It is not a weakly prime, because it can be changed into another prime (20619349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10309664 + 10309665.

It is an arithmetic number, because the mean of its divisors is an integer number (10309665).

Almost surely, 2^20619329 is an apocalyptic number.

It is an amenable number.

20619329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20619329 is an equidigital number, since it uses as much as digits as its factorization.

20619329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 20619329 is about 4540.8511316712. The cubic root of 20619329 is about 274.2151904991.

The spelling of 20619329 in words is "twenty million, six hundred nineteen thousand, three hundred twenty-nine".