20587982101 has 2 divisors, whose sum is σ = 20587982102. Its totient is φ = 20587982100.

The previous prime is 20587982053. The next prime is 20587982119. The reversal of 20587982101 is 10128978502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20491922500 + 96059601 = 143150^2 + 9801^2 .

It is a cyclic number.

It is not a de Polignac number, because 20587982101 - 2²³ = 20579593493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20587982201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10293991050 + 10293991051.

It is an arithmetic number, because the mean of its divisors is an integer number (10293991051).

Almost surely, 2^20587982101 is an apocalyptic number.

It is an amenable number.

20587982101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20587982101 is an equidigital number, since it uses as much as digits as its factorization.

20587982101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 20587982101 in words is "twenty billion, five hundred eighty-seven million, nine hundred eighty-two thousand, one hundred one".