20781422613 has 40 divisors (see below), whose sum is σ = 35504420160. Its totient is φ = 11866487040.

The previous prime is 20781422611. The next prime is 20781422633. The reversal of 20781422613 is 31622418702.

It is a happy number.

20781422613 is a `hidden beast` number, since 2 + 0 + 7 + 8 + 14 + 22 + 613 = 666.

It is not a de Polignac number, because 20781422613 - 2¹ = 20781422611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20781422611) 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 in 39 ways as a sum of consecutive naturals, for example, 814693 + ... + 839813.

It is an arithmetic number, because the mean of its divisors is an integer number (887610504).

Almost surely, 2^20781422613 is an apocalyptic number.

It is an amenable number.

20781422613 is a deficient number, since it is larger than the sum of its proper divisors (14722997547).

20781422613 is a wasteful number, since it uses less digits than its factorization.

20781422613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26599 (or 26590 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 20781422613 in words is "twenty billion, seven hundred eighty-one million, four hundred twenty-two thousand, six hundred thirteen".