20648884577 has 2 divisors, whose sum is σ = 20648884578. Its totient is φ = 20648884576.

The previous prime is 20648884541. The next prime is 20648884651. The reversal of 20648884577 is 77548884602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14612216161 + 6036668416 = 120881^2 + 77696^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648884577 - 2²² = 20644690273 is a prime.

It is a super-3 number, since 3×20648884577³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20648887577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324442288 + 10324442289.

It is an arithmetic number, because the mean of its divisors is an integer number (10324442289).

Almost surely, 2^20648884577 is an apocalyptic number.

It is an amenable number.

20648884577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648884577 is an equidigital number, since it uses as much as digits as its factorization.

20648884577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24084480, while the sum is 59.

The spelling of 20648884577 in words is "twenty billion, six hundred forty-eight million, eight hundred eighty-four thousand, five hundred seventy-seven".