20356721012 has 6 divisors (see below), whose sum is σ = 35624261778. Its totient is φ = 10178360504.

The previous prime is 20356720999. The next prime is 20356721039. The reversal of 20356721012 is 21012765302.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19719461476 + 637259536 = 140426^2 + 25244^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2544590123 + ... + 2544590130.

It is an arithmetic number, because the mean of its divisors is an integer number (5937376963).

Almost surely, 2^20356721012 is an apocalyptic number.

It is an amenable number.

20356721012 is a deficient number, since it is larger than the sum of its proper divisors (15267540766).

20356721012 is a wasteful number, since it uses less digits than its factorization.

20356721012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089180257 (or 5089180255 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The spelling of 20356721012 in words is "twenty billion, three hundred fifty-six million, seven hundred twenty-one thousand, twelve".