20736520111 has 4 divisors (see below), whose sum is σ = 20743167424. Its totient is φ = 20729872800.

The previous prime is 20736520109. The next prime is 20736520121. The reversal of 20736520111 is 11102563702.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20736520111 - 2¹ = 20736520109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20736520111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20736520121) 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, 3318975 + ... + 3325216.

It is an arithmetic number, because the mean of its divisors is an integer number (5185791856).

Almost surely, 2^20736520111 is an apocalyptic number.

20736520111 is a deficient number, since it is larger than the sum of its proper divisors (6647313).

20736520111 is an equidigital number, since it uses as much as digits as its factorization.

20736520111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6647312.

The product of its (nonzero) digits is 2520, while the sum is 28.

The spelling of 20736520111 in words is "twenty billion, seven hundred thirty-six million, five hundred twenty thousand, one hundred eleven".