20731213207 has 2 divisors, whose sum is σ = 20731213208. Its totient is φ = 20731213206.

The previous prime is 20731213201. The next prime is 20731213219. The reversal of 20731213207 is 70231213702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20731213207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20731213201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365606603 + 10365606604.

It is an arithmetic number, because the mean of its divisors is an integer number (10365606604).

Almost surely, 2^20731213207 is an apocalyptic number.

20731213207 is a deficient number, since it is larger than the sum of its proper divisors (1).

20731213207 is an equidigital number, since it uses as much as digits as its factorization.

20731213207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 28.

Adding to 20731213207 its reverse (70231213702), we get a palindrome (90962426909).

The spelling of 20731213207 in words is "twenty billion, seven hundred thirty-one million, two hundred thirteen thousand, two hundred seven".