20956135401 has 20 divisors (see below), whose sum is σ = 31627586452. Its totient is φ = 13826723328.

The previous prime is 20956135363. The next prime is 20956135451. The reversal of 20956135401 is 10453165902.

20956135401 is a `hidden beast` number, since 20 + 9 + 561 + 35 + 40 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9915379776 + 11040755625 = 99576^2 + 105075^2 .

It is not a de Polignac number, because 20956135401 - 2⁷ = 20956135273 is a prime.

It is a super-2 number, since 2×20956135401² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20956135451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1325740 + ... + 1341453.

Almost surely, 2^20956135401 is an apocalyptic number.

It is an amenable number.

20956135401 is a deficient number, since it is larger than the sum of its proper divisors (10671451051).

20956135401 is an equidigital number, since it uses as much as digits as its factorization.

20956135401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667302 (or 2667293 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 20956135401 in words is "twenty billion, nine hundred fifty-six million, one hundred thirty-five thousand, four hundred one".