20610814381 has 4 divisors (see below), whose sum is σ = 20611108672. Its totient is φ = 20610520092.

The previous prime is 20610814351. The next prime is 20610814409. The reversal of 20610814381 is 18341801602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20610814381 - 2⁷ = 20610814253 is a prime.

It is a super-2 number, since 2×20610814381² (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 (20610814351) 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 in 3 ways as a sum of consecutive naturals, for example, 25180 + ... + 204586.

It is an arithmetic number, because the mean of its divisors is an integer number (5152777168).

Almost surely, 2^20610814381 is an apocalyptic number.

It is an amenable number.

20610814381 is a deficient number, since it is larger than the sum of its proper divisors (294291).

20610814381 is a wasteful number, since it uses less digits than its factorization.

20610814381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294290.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 20610814381 in words is "twenty billion, six hundred ten million, eight hundred fourteen thousand, three hundred eighty-one".