20693389 has 2 divisors, whose sum is σ = 20693390. Its totient is φ = 20693388.

The previous prime is 20693381. The next prime is 20693423. The reversal of 20693389 is 98339602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13564489 + 7128900 = 3683^2 + 2670^2 .

It is a cyclic number.

It is not a de Polignac number, because 20693389 - 2³ = 20693381 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 (20693381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10346694 + 10346695.

It is an arithmetic number, because the mean of its divisors is an integer number (10346695).

Almost surely, 2^20693389 is an apocalyptic number.

It is an amenable number.

20693389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20693389 is an equidigital number, since it uses as much as digits as its factorization.

20693389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 20693389 is about 4548.9986810286. The cubic root of 20693389 is about 274.5431046782.

The spelling of 20693389 in words is "twenty million, six hundred ninety-three thousand, three hundred eighty-nine".