20631343 has 2 divisors, whose sum is σ = 20631344. Its totient is φ = 20631342.

The previous prime is 20631293. The next prime is 20631367. The reversal of 20631343 is 34313602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20631343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20631043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10315671 + 10315672.

It is an arithmetic number, because the mean of its divisors is an integer number (10315672).

Almost surely, 2^20631343 is an apocalyptic number.

20631343 is a deficient number, since it is larger than the sum of its proper divisors (1).

20631343 is an equidigital number, since it uses as much as digits as its factorization.

20631343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 20631343 is about 4542.1738187788. The cubic root of 20631343 is about 274.2684379749.

Adding to 20631343 its reverse (34313602), we get a palindrome (54944945).

The spelling of 20631343 in words is "twenty million, six hundred thirty-one thousand, three hundred forty-three".