20111552431550 has 48 divisors (see below), whose sum is σ = 37515680405280. Its totient is φ = 8021356400640.

The previous prime is 20111552431511. The next prime is 20111552431561. The reversal of 20111552431550 is 5513425511102.

It is a self number, because there is not a number n which added to its sum of digits gives 20111552431550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 594841046 + ... + 594874854.

It is an arithmetic number, because the mean of its divisors is an integer number (781576675110).

Almost surely, 2^{20111552431550} is an apocalyptic number.

20111552431550 is a deficient number, since it is larger than the sum of its proper divisors (17404127973730).

20111552431550 is a wasteful number, since it uses less digits than its factorization.

20111552431550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67877 (or 67872 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 35.

Adding to 20111552431550 its reverse (5513425511102), we get a palindrome (25624977942652).

The spelling of 20111552431550 in words is "twenty trillion, one hundred eleven billion, five hundred fifty-two million, four hundred thirty-one thousand, five hundred fifty".