20328629 has 2 divisors, whose sum is σ = 20328630. Its totient is φ = 20328628.

The previous prime is 20328589. The next prime is 20328631. The reversal of 20328629 is 92682302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 6115729 = 3770^2 + 2473^2 .

It is a cyclic number.

It is not a de Polignac number, because 20328629 - 2¹⁶ = 20263093 is a prime.

Together with 20328631, 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 = 20328595 and 20328604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20328029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10164314 + 10164315.

It is an arithmetic number, because the mean of its divisors is an integer number (10164315).

Almost surely, 2^20328629 is an apocalyptic number.

It is an amenable number.

20328629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20328629 is an equidigital number, since it uses as much as digits as its factorization.

20328629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20328629 is about 4508.7280911583. The cubic root of 20328629 is about 272.9204194060.

The spelling of 20328629 in words is "twenty million, three hundred twenty-eight thousand, six hundred twenty-nine".