20401401187 has 2 divisors, whose sum is σ = 20401401188. Its totient is φ = 20401401186.

The previous prime is 20401401173. The next prime is 20401401253. The reversal of 20401401187 is 78110410402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20401401187 - 2²⁷ = 20267183459 is a prime.

It is not a weakly prime, because it can be changed into another prime (20401405187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200700593 + 10200700594.

It is an arithmetic number, because the mean of its divisors is an integer number (10200700594).

Almost surely, 2^20401401187 is an apocalyptic number.

20401401187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401401187 is an equidigital number, since it uses as much as digits as its factorization.

20401401187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

Adding to 20401401187 its reverse (78110410402), we get a palindrome (98511811589).

The spelling of 20401401187 in words is "twenty billion, four hundred one million, four hundred one thousand, one hundred eighty-seven".