20712493 has 2 divisors, whose sum is σ = 20712494. Its totient is φ = 20712492.

The previous prime is 20712491. The next prime is 20712499. The reversal of 20712493 is 39421702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14768649 + 5943844 = 3843^2 + 2438^2 .

It is a cyclic number.

It is not a de Polignac number, because 20712493 - 2¹ = 20712491 is a prime.

Together with 20712491, 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 (20712491) 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, 10356246 + 10356247.

It is an arithmetic number, because the mean of its divisors is an integer number (10356247).

Almost surely, 2^20712493 is an apocalyptic number.

It is an amenable number.

20712493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712493 is an equidigital number, since it uses as much as digits as its factorization.

20712493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20712493 is about 4551.0979993843. The cubic root of 20712493 is about 274.6275641529.

The spelling of 20712493 in words is "twenty million, seven hundred twelve thousand, four hundred ninety-three".