20540720193 has 16 divisors (see below), whose sum is σ = 32661021696. Its totient is φ = 11227225680.

The previous prime is 20540720143. The next prime is 20540720197. The reversal of 20540720193 is 39102704502.

It is not a de Polignac number, because 20540720193 - 2²¹ = 20538623041 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 21263203 + ... + 21264168.

It is an arithmetic number, because the mean of its divisors is an integer number (2041313856).

Almost surely, 2^20540720193 is an apocalyptic number.

20540720193 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20540720193 is a deficient number, since it is larger than the sum of its proper divisors (12120301503).

20540720193 is a wasteful number, since it uses less digits than its factorization.

20540720193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42527404.

The product of its (nonzero) digits is 15120, while the sum is 33.

The spelling of 20540720193 in words is "twenty billion, five hundred forty million, seven hundred twenty thousand, one hundred ninety-three".