20103405181 has 4 divisors (see below), whose sum is σ = 20113915932. Its totient is φ = 20092894432.

The previous prime is 20103405163. The next prime is 20103405187. The reversal of 20103405181 is 18150430102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18541179556 + 1562225625 = 136166^2 + 39525^2 .

It is a cyclic number.

It is not a de Polignac number, because 20103405181 - 2⁹ = 20103404669 is a prime.

It is a super-2 number, since 2×20103405181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103405187) 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 3 ways as a sum of consecutive naturals, for example, 5252506 + ... + 5256331.

It is an arithmetic number, because the mean of its divisors is an integer number (5028478983).

Almost surely, 2^20103405181 is an apocalyptic number.

It is an amenable number.

20103405181 is a deficient number, since it is larger than the sum of its proper divisors (10510751).

20103405181 is a wasteful number, since it uses less digits than its factorization.

20103405181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510750.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 20103405181 its reverse (18150430102), we get a palindrome (38253835283).

The spelling of 20103405181 in words is "twenty billion, one hundred three million, four hundred five thousand, one hundred eighty-one".