20680135479 has 12 divisors (see below), whose sum is σ = 30022940376. Its totient is φ = 13716772272.

The previous prime is 20680135459. The next prime is 20680135507. The reversal of 20680135479 is 97453108602.

20680135479 is a `hidden beast` number, since 20 + 6 + 80 + 1 + 3 + 547 + 9 = 666.

It is not a de Polignac number, because 20680135479 - 2⁵ = 20680135447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20680135459) 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 11 ways as a sum of consecutive naturals, for example, 5830189 + ... + 5833734.

It is an arithmetic number, because the mean of its divisors is an integer number (2501911698).

It is a 2-persistent number, because it is pandigital, and so is 2⋅20680135479 = 41360270958, but 3⋅20680135479 = 62040406437 is not.

Almost surely, 2^20680135479 is an apocalyptic number.

20680135479 is a deficient number, since it is larger than the sum of its proper divisors (9342804897).

20680135479 is a wasteful number, since it uses less digits than its factorization.

20680135479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11664126 (or 11664123 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 20680135479 in words is "twenty billion, six hundred eighty million, one hundred thirty-five thousand, four hundred seventy-nine".