20631293 has 2 divisors, whose sum is σ = 20631294. Its totient is φ = 20631292.

The previous prime is 20631269. The next prime is 20631343. The reversal of 20631293 is 39213602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18679684 + 1951609 = 4322^2 + 1397^2 .

It is a cyclic number.

It is not a de Polignac number, because 20631293 - 2⁶ = 20631229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20631203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10315646 + 10315647.

It is an arithmetic number, because the mean of its divisors is an integer number (10315647).

Almost surely, 2^20631293 is an apocalyptic number.

It is an amenable number.

20631293 is a deficient number, since it is larger than the sum of its proper divisors (1).

20631293 is an equidigital number, since it uses as much as digits as its factorization.

20631293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 20631293 is about 4542.1683148030. The cubic root of 20631293 is about 274.2682164118.

Adding to 20631293 its reverse (39213602), we get a palindrome (59844895).

The spelling of 20631293 in words is "twenty million, six hundred thirty-one thousand, two hundred ninety-three".