20111231000 has 64 divisors (see below), whose sum is σ = 53783196480. Its totient is φ = 6895276800.

The previous prime is 20111230991. The next prime is 20111231003. The reversal of 20111231000 is 13211102.

It is a super-2 number, since 2×20111231000² (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 (20111231003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1429517 + ... + 1443516.

It is an arithmetic number, because the mean of its divisors is an integer number (840362445).

Almost surely, 2^20111231000 is an apocalyptic number.

20111231000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111231000 is an abundant number, since it is smaller than the sum of its proper divisors (33671965480).

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

20111231000 is a wasteful number, since it uses less digits than its factorization.

20111231000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873061 (or 2873047 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20111231000 its reverse (13211102), we get a palindrome (20124442102).

The spelling of 20111231000 in words is "twenty billion, one hundred eleven million, two hundred thirty-one thousand".