20544515111 has 4 divisors (see below), whose sum is σ = 21625805400. Its totient is φ = 19463224824.

The previous prime is 20544515081. The next prime is 20544515137. The reversal of 20544515111 is 11151544502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20544515111 is a prime.

It is a super-2 number, since 2×20544515111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20544515311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540645116 + ... + 540645153.

It is an arithmetic number, because the mean of its divisors is an integer number (5406451350).

Almost surely, 2^20544515111 is an apocalyptic number.

20544515111 is a deficient number, since it is larger than the sum of its proper divisors (1081290289).

20544515111 is a wasteful number, since it uses less digits than its factorization.

20544515111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081290288.

The product of its (nonzero) digits is 4000, while the sum is 29.

The spelling of 20544515111 in words is "twenty billion, five hundred forty-four million, five hundred fifteen thousand, one hundred eleven".