20894687911 has 2 divisors, whose sum is σ = 20894687912. Its totient is φ = 20894687910.

The previous prime is 20894687867. The next prime is 20894687951. The reversal of 20894687911 is 11978649802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20894687911 - 2²⁵ = 20861133479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20894687951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10447343955 + 10447343956.

It is an arithmetic number, because the mean of its divisors is an integer number (10447343956).

Almost surely, 2^20894687911 is an apocalyptic number.

20894687911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20894687911 is an equidigital number, since it uses as much as digits as its factorization.

20894687911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 20894687911 in words is "twenty billion, eight hundred ninety-four million, six hundred eighty-seven thousand, nine hundred eleven".