26720231 has 2 divisors, whose sum is σ = 26720232. Its totient is φ = 26720230.

The previous prime is 26720219. The next prime is 26720237. The reversal of 26720231 is 13202762.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26720231 - 2¹⁰ = 26719207 is a prime.

It is a super-2 number, since 2×26720231² = 1427941489386722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26720197 and 26720206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26720237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13360115 + 13360116.

It is an arithmetic number, because the mean of its divisors is an integer number (13360116).

Almost surely, 2^26720231 is an apocalyptic number.

26720231 is a deficient number, since it is larger than the sum of its proper divisors (1).

26720231 is an equidigital number, since it uses as much as digits as its factorization.

26720231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 26720231 is about 5169.1615374256. The cubic root of 26720231 is about 298.9602188660.

Adding to 26720231 its reverse (13202762), we get a palindrome (39922993).

The spelling of 26720231 in words is "twenty-six million, seven hundred twenty thousand, two hundred thirty-one".