20631554101 has 2 divisors, whose sum is σ = 20631554102. Its totient is φ = 20631554100.

The previous prime is 20631554089. The next prime is 20631554107. The reversal of 20631554101 is 10145513602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15918868900 + 4712685201 = 126170^2 + 68649^2 .

It is a cyclic number.

It is not a de Polignac number, because 20631554101 - 2⁷ = 20631553973 is a prime.

It is a super-2 number, since 2×20631554101² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20631554101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20631554107) 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, 10315777050 + 10315777051.

It is an arithmetic number, because the mean of its divisors is an integer number (10315777051).

Almost surely, 2^20631554101 is an apocalyptic number.

It is an amenable number.

20631554101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20631554101 is an equidigital number, since it uses as much as digits as its factorization.

20631554101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 20631554101 in words is "twenty billion, six hundred thirty-one million, five hundred fifty-four thousand, one hundred one".