20779519331 has 2 divisors, whose sum is σ = 20779519332. Its totient is φ = 20779519330.

The previous prime is 20779519301. The next prime is 20779519357. The reversal of 20779519331 is 13391597702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20779519331 - 2¹⁰ = 20779518307 is a prime.

It is a super-2 number, since 2×20779519331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20779519301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389759665 + 10389759666.

It is an arithmetic number, because the mean of its divisors is an integer number (10389759666).

Almost surely, 2^20779519331 is an apocalyptic number.

20779519331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20779519331 is an equidigital number, since it uses as much as digits as its factorization.

20779519331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 357210, while the sum is 47.

The spelling of 20779519331 in words is "twenty billion, seven hundred seventy-nine million, five hundred nineteen thousand, three hundred thirty-one".