20423550111 has 16 divisors (see below), whose sum is σ = 27520926048. Its totient is φ = 13471027200.

The previous prime is 20423550109. The next prime is 20423550157. The reversal of 20423550111 is 11105532402.

It is a happy number.

It is not a de Polignac number, because 20423550111 - 2¹ = 20423550109 is a prime.

It is a super-2 number, since 2×20423550111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423550101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1085121 + ... + 1103781.

It is an arithmetic number, because the mean of its divisors is an integer number (1720057878).

Almost surely, 2^20423550111 is an apocalyptic number.

20423550111 is a deficient number, since it is larger than the sum of its proper divisors (7097375937).

20423550111 is a wasteful number, since it uses less digits than its factorization.

20423550111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22522.

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 20423550111 in words is "twenty billion, four hundred twenty-three million, five hundred fifty thousand, one hundred eleven".