20841755867 has 2 divisors, whose sum is σ = 20841755868. Its totient is φ = 20841755866.

The previous prime is 20841755849. The next prime is 20841755903. The reversal of 20841755867 is 76855714802.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20841755867 is a prime.

It is not a weakly prime, because it can be changed into another prime (20841755807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420877933 + 10420877934.

It is an arithmetic number, because the mean of its divisors is an integer number (10420877934).

Almost surely, 2^20841755867 is an apocalyptic number.

20841755867 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841755867 is an equidigital number, since it uses as much as digits as its factorization.

20841755867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 20841755867 in words is "twenty billion, eight hundred forty-one million, seven hundred fifty-five thousand, eight hundred sixty-seven".