20687068901 has 2 divisors, whose sum is σ = 20687068902. Its totient is φ = 20687068900.

The previous prime is 20687068867. The next prime is 20687068921. The reversal of 20687068901 is 10986078602.

It is a Cunningham number, because it is equal to 143830²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20687068900 + 1 = 143830^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 20687068901 - 2²⁶ = 20619960037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20687068921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10343534450 + 10343534451.

It is an arithmetic number, because the mean of its divisors is an integer number (10343534451).

Almost surely, 2^20687068901 is an apocalyptic number.

It is an amenable number.

20687068901 is a deficient number, since it is larger than the sum of its proper divisors (1).

20687068901 is an equidigital number, since it uses as much as digits as its factorization.

20687068901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 20687068901 in words is "twenty billion, six hundred eighty-seven million, sixty-eight thousand, nine hundred one".