26220431 has 2 divisors, whose sum is σ = 26220432. Its totient is φ = 26220430.

The previous prime is 26220421. The next prime is 26220433. The reversal of 26220431 is 13402262.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26220431 is a prime.

It is a super-2 number, since 2×26220431² = 1375022003651522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 26220433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26220433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13110215 + 13110216.

It is an arithmetic number, because the mean of its divisors is an integer number (13110216).

Almost surely, 2^26220431 is an apocalyptic number.

26220431 is a deficient number, since it is larger than the sum of its proper divisors (1).

26220431 is an equidigital number, since it uses as much as digits as its factorization.

26220431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 26220431 is about 5120.5889309727. The cubic root of 26220431 is about 297.0844647098.

Adding to 26220431 its reverse (13402262), we get a palindrome (39622693).

The spelling of 26220431 in words is "twenty-six million, two hundred twenty thousand, four hundred thirty-one".