20111045550 has 48 divisors (see below), whose sum is σ = 49910972160. Its totient is φ = 5359119840.

The previous prime is 20111045533. The next prime is 20111045557. The reversal of 20111045550 is 5554011102.

It is a super-2 number, since 2×20111045550² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20111045550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111045557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166341 + ... + 260559.

It is an arithmetic number, because the mean of its divisors is an integer number (1039811920).

Almost surely, 2^20111045550 is an apocalyptic number.

20111045550 is an abundant number, since it is smaller than the sum of its proper divisors (29799926610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111045550 is a wasteful number, since it uses less digits than its factorization.

20111045550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95657 (or 95652 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

Adding to 20111045550 its reverse (5554011102), we get a palindrome (25665056652).

The spelling of 20111045550 in words is "twenty billion, one hundred eleven million, forty-five thousand, five hundred fifty".