20411200991 has 2 divisors, whose sum is σ = 20411200992. Its totient is φ = 20411200990.

The previous prime is 20411200987. The next prime is 20411201017. The reversal of 20411200991 is 19900211402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20411200991 - 2² = 20411200987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20411200591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10205600495 + 10205600496.

It is an arithmetic number, because the mean of its divisors is an integer number (10205600496).

Almost surely, 2^20411200991 is an apocalyptic number.

20411200991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20411200991 is an equidigital number, since it uses as much as digits as its factorization.

20411200991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 20411200991 in words is "twenty billion, four hundred eleven million, two hundred thousand, nine hundred ninety-one".