20930950856 has 8 divisors (see below), whose sum is σ = 39245532870. Its totient is φ = 10465475424.

The previous prime is 20930950819. The next prime is 20930950897. The reversal of 20930950856 is 65805903902.

It can be written as a sum of positive squares in only one way, i.e., 19833088900 + 1097861956 = 140830^2 + 33134^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20930950856.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1308184421 + ... + 1308184436.

Almost surely, 2^20930950856 is an apocalyptic number.

It is an amenable number.

20930950856 is a deficient number, since it is larger than the sum of its proper divisors (18314582014).

20930950856 is a wasteful number, since it uses less digits than its factorization.

20930950856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616368863 (or 2616368859 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 20930950856 in words is "twenty billion, nine hundred thirty million, nine hundred fifty thousand, eight hundred fifty-six".