20901888001 has 2 divisors, whose sum is σ = 20901888002. Its totient is φ = 20901888000.

The previous prime is 20901887999. The next prime is 20901888047. The reversal of 20901888001 is 10088810902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16702977600 + 4198910401 = 129240^2 + 64799^2 .

It is a cyclic number.

It is not a de Polignac number, because 20901888001 - 2¹ = 20901887999 is a prime.

Together with 20901887999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20901888071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10450944000 + 10450944001.

It is an arithmetic number, because the mean of its divisors is an integer number (10450944001).

Almost surely, 2^20901888001 is an apocalyptic number.

It is an amenable number.

20901888001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20901888001 is an equidigital number, since it uses as much as digits as its factorization.

20901888001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 37.

The spelling of 20901888001 in words is "twenty billion, nine hundred one million, eight hundred eighty-eight thousand, one".