20731267 has 2 divisors, whose sum is σ = 20731268. Its totient is φ = 20731266.

The previous prime is 20731253. The next prime is 20731273. The reversal of 20731267 is 76213702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20731267 is a prime.

It is not a weakly prime, because it can be changed into another prime (20731247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365633 + 10365634.

It is an arithmetic number, because the mean of its divisors is an integer number (10365634).

Almost surely, 2^20731267 is an apocalyptic number.

20731267 is a deficient number, since it is larger than the sum of its proper divisors (1).

20731267 is an equidigital number, since it uses as much as digits as its factorization.

20731267 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.

The square root of 20731267 is about 4553.1601113952. The cubic root of 20731267 is about 274.7105141049.

Adding to 20731267 its reverse (76213702), we get a palindrome (96944969).

The spelling of 20731267 in words is "twenty million, seven hundred thirty-one thousand, two hundred sixty-seven".