20131307779 has 16 divisors (see below), whose sum is σ = 22542530400. Its totient is φ = 17822880000.

The previous prime is 20131307761. The next prime is 20131307969. The reversal of 20131307779 is 97770313102.

It is a cyclic number.

It is not a de Polignac number, because 20131307779 - 2²¹ = 20129210627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131307719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80754 + ... + 216295.

It is an arithmetic number, because the mean of its divisors is an integer number (1408908150).

Almost surely, 2^20131307779 is an apocalyptic number.

20131307779 is a deficient number, since it is larger than the sum of its proper divisors (2411222621).

20131307779 is a wasteful number, since it uses less digits than its factorization.

20131307779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297222.

The product of its (nonzero) digits is 55566, while the sum is 40.

The spelling of 20131307779 in words is "twenty billion, one hundred thirty-one million, three hundred seven thousand, seven hundred seventy-nine".