20540720194 has 16 divisors (see below), whose sum is σ = 31136628600. Its totient is φ = 10161897984.

The previous prime is 20540720143. The next prime is 20540720197. The reversal of 20540720194 is 49102704502.

It can be written as a sum of positive squares in 4 ways, for example, as 8066734225 + 12473985969 = 89815^2 + 111687^2 .

It is not an unprimeable number, because it can be changed into a prime (20540720197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 918012 + ... + 940120.

Almost surely, 2^20540720194 is an apocalyptic number.

20540720194 is a deficient number, since it is larger than the sum of its proper divisors (10595908406).

20540720194 is a wasteful number, since it uses less digits than its factorization.

20540720194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26997.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 20540720194 in words is "twenty billion, five hundred forty million, seven hundred twenty thousand, one hundred ninety-four".