20626789 has 2 divisors, whose sum is σ = 20626790. Its totient is φ = 20626788.

The previous prime is 20626787. The next prime is 20626841. The reversal of 20626789 is 98762602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19210689 + 1416100 = 4383^2 + 1190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20626789 - 2¹ = 20626787 is a prime.

Together with 20626787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20626783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10313394 + 10313395.

It is an arithmetic number, because the mean of its divisors is an integer number (10313395).

Almost surely, 2^20626789 is an apocalyptic number.

It is an amenable number.

20626789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20626789 is an equidigital number, since it uses as much as digits as its factorization.

20626789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20626789 is about 4541.6724892929. The cubic root of 20626789 is about 274.2482565390.

The spelling of 20626789 in words is "twenty million, six hundred twenty-six thousand, seven hundred eighty-nine".