20261243626423 has 2 divisors, whose sum is σ = 20261243626424. Its totient is φ = 20261243626422.

The previous prime is 20261243626373. The next prime is 20261243626427. The reversal of 20261243626423 is 32462634216202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20261243626423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20261243626423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20261243626427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130621813211 + 10130621813212.

It is an arithmetic number, because the mean of its divisors is an integer number (10130621813212).

Almost surely, 2^{20261243626423} is an apocalyptic number.

20261243626423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20261243626423 is an equidigital number, since it uses as much as digits as its factorization.

20261243626423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 43.

The spelling of 20261243626423 in words is "twenty trillion, two hundred sixty-one billion, two hundred forty-three million, six hundred twenty-six thousand, four hundred twenty-three".