20111023240 has 128 divisors (see below), whose sum is σ = 58360953600. Its totient is φ = 6052193280.

The previous prime is 20111023223. The next prime is 20111023301. The reversal of 20111023240 is 4232011102.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23259 + ... + 201898.

It is an arithmetic number, because the mean of its divisors is an integer number (455944950).

Almost surely, 2^20111023240 is an apocalyptic number.

20111023240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111023240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29180476800).

20111023240 is an abundant number, since it is smaller than the sum of its proper divisors (38249930360).

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

20111023240 is a wasteful number, since it uses less digits than its factorization.

20111023240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225215 (or 225211 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20111023240 its reverse (4232011102), we get a palindrome (24343034342).

The spelling of 20111023240 in words is "twenty billion, one hundred eleven million, twenty-three thousand, two hundred forty".