20629391 has 2 divisors, whose sum is σ = 20629392. Its totient is φ = 20629390.

The previous prime is 20629361. The next prime is 20629417. The reversal of 20629391 is 19392602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20629391 - 2⁶ = 20629327 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 (20629331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314695 + 10314696.

It is an arithmetic number, because the mean of its divisors is an integer number (10314696).

Almost surely, 2^20629391 is an apocalyptic number.

20629391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20629391 is an equidigital number, since it uses as much as digits as its factorization.

20629391 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 20629391 is about 4541.9589386079. The cubic root of 20629391 is about 274.2597878856.

The spelling of 20629391 in words is "twenty million, six hundred twenty-nine thousand, three hundred ninety-one".