20480181779 has 2 divisors, whose sum is σ = 20480181780. Its totient is φ = 20480181778.

The previous prime is 20480181769. The next prime is 20480181797. The reversal of 20480181779 is 97718108402.

It is a happy number.

Together with next prime (20480181797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20480181779 is a prime.

It is not a weakly prime, because it can be changed into another prime (20480181749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10240090889 + 10240090890.

It is an arithmetic number, because the mean of its divisors is an integer number (10240090890).

Almost surely, 2^20480181779 is an apocalyptic number.

20480181779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20480181779 is an equidigital number, since it uses as much as digits as its factorization.

20480181779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 47.

The spelling of 20480181779 in words is "twenty billion, four hundred eighty million, one hundred eighty-one thousand, seven hundred seventy-nine".