20591629 has 2 divisors, whose sum is σ = 20591630. Its totient is φ = 20591628.

The previous prime is 20591617. The next prime is 20591639. The reversal of 20591629 is 92619502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13176900 + 7414729 = 3630^2 + 2723^2 .

It is a cyclic number.

It is not a de Polignac number, because 20591629 - 2¹⁵ = 20558861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20591594 and 20591603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20591609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10295814 + 10295815.

It is an arithmetic number, because the mean of its divisors is an integer number (10295815).

Almost surely, 2^20591629 is an apocalyptic number.

It is an amenable number.

20591629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20591629 is an equidigital number, since it uses as much as digits as its factorization.

20591629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 20591629 is about 4537.8000176297. The cubic root of 20591629 is about 274.0923419379.

The spelling of 20591629 in words is "twenty million, five hundred ninety-one thousand, six hundred twenty-nine".