20212738856 has 8 divisors (see below), whose sum is σ = 37898885370. Its totient is φ = 10106369424.

The previous prime is 20212738841. The next prime is 20212738877. The reversal of 20212738856 is 65883721202.

It can be written as a sum of positive squares in only one way, i.e., 14432177956 + 5780560900 = 120134^2 + 76030^2 .

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

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, 1263296171 + ... + 1263296186.

Almost surely, 2^20212738856 is an apocalyptic number.

It is an amenable number.

20212738856 is a deficient number, since it is larger than the sum of its proper divisors (17686146514).

20212738856 is a wasteful number, since it uses less digits than its factorization.

20212738856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526592363 (or 2526592359 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 20212738856 in words is "twenty billion, two hundred twelve million, seven hundred thirty-eight thousand, eight hundred fifty-six".