20312407 has 2 divisors, whose sum is σ = 20312408. Its totient is φ = 20312406.

The previous prime is 20312393. The next prime is 20312419. The reversal of 20312407 is 70421302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156203 + 10156204.

It is an arithmetic number, because the mean of its divisors is an integer number (10156204).

Almost surely, 2^20312407 is an apocalyptic number.

20312407 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312407 is an equidigital number, since it uses as much as digits as its factorization.

20312407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20312407 is about 4506.9287768945. The cubic root of 20312407 is about 272.8478043563.

Adding to 20312407 its reverse (70421302), we get a palindrome (90733709).

The spelling of 20312407 in words is "twenty million, three hundred twelve thousand, four hundred seven".