20111223040 has 144 divisors (see below), whose sum is σ = 51113801088. Its totient is φ = 7555350528.

The previous prime is 20111223019. The next prime is 20111223043. The reversal of 20111223040 is 4032211102.

It is a super-2 number, since 2×20111223040² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20111223043) 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, 17907919 + ... + 17909041.

It is an arithmetic number, because the mean of its divisors is an integer number (354956952).

Almost surely, 2^20111223040 is an apocalyptic number.

20111223040 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 20111223040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25556900544).

20111223040 is an abundant number, since it is smaller than the sum of its proper divisors (31002578048).

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

20111223040 is a wasteful number, since it uses less digits than its factorization.

20111223040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984 (or 1970 counting only the distinct ones).

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

Adding to 20111223040 its reverse (4032211102), we get a palindrome (24143434142).

The spelling of 20111223040 in words is "twenty billion, one hundred eleven million, two hundred twenty-three thousand, forty".