20850257668 has 6 divisors (see below), whose sum is σ = 36487950926. Its totient is φ = 10425128832.

The previous prime is 20850257579. The next prime is 20850257693. The reversal of 20850257668 is 86675205802.

It can be written as a sum of positive squares in only one way, i.e., 18301219524 + 2549038144 = 135282^2 + 50488^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2606282205 + ... + 2606282212.

Almost surely, 2^20850257668 is an apocalyptic number.

It is an amenable number.

20850257668 is a deficient number, since it is larger than the sum of its proper divisors (15637693258).

20850257668 is a wasteful number, since it uses less digits than its factorization.

20850257668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5212564421 (or 5212564419 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 20850257668 in words is "twenty billion, eight hundred fifty million, two hundred fifty-seven thousand, six hundred sixty-eight".