20311481866 has 16 divisors (see below), whose sum is σ = 32814369000. Its totient is φ = 9373526208.

The previous prime is 20311481863. The next prime is 20311481899. The reversal of 20311481866 is 66818411302.

It can be written as a sum of positive squares in 4 ways, for example, as 20198378641 + 113103225 = 142121^2 + 10635^2 .

It is not an unprimeable number, because it can be changed into a prime (20311481863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241960 + ... + 314908.

Almost surely, 2^20311481866 is an apocalyptic number.

20311481866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20311481866 is a deficient number, since it is larger than the sum of its proper divisors (12502887134).

20311481866 is a wasteful number, since it uses less digits than its factorization.

20311481866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83673.

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 20311481866 in words is "twenty billion, three hundred eleven million, four hundred eighty-one thousand, eight hundred sixty-six".