20701648889 has 2 divisors, whose sum is σ = 20701648890. Its totient is φ = 20701648888.

The previous prime is 20701648883. The next prime is 20701648993. The reversal of 20701648889 is 98884610702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12298810000 + 8402838889 = 110900^2 + 91667^2 .

It is a cyclic number.

It is not a de Polignac number, because 20701648889 - 2⁸ = 20701648633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20701648889.

It is not a weakly prime, because it can be changed into another prime (20701648883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350824444 + 10350824445.

It is an arithmetic number, because the mean of its divisors is an integer number (10350824445).

Almost surely, 2^20701648889 is an apocalyptic number.

It is an amenable number.

20701648889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20701648889 is an equidigital number, since it uses as much as digits as its factorization.

20701648889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1548288, while the sum is 53.

The spelling of 20701648889 in words is "twenty billion, seven hundred one million, six hundred forty-eight thousand, eight hundred eighty-nine".