20011100040 has 48 divisors (see below), whose sum is σ = 65036076300. Its totient is φ = 5336293248.

The previous prime is 20011100023. The next prime is 20011100041. The reversal of 20011100040 is 4000111002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19428456996 + 582643044 = 139386^2 + 24138^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20011099995 and 20011100031.

It is not an unprimeable number, because it can be changed into a prime (20011100041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27792835 + ... + 27793554.

Almost surely, 2^20011100040 is an apocalyptic number.

20011100040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011100040 is an abundant number, since it is smaller than the sum of its proper divisors (45024976260).

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

20011100040 is a wasteful number, since it uses less digits than its factorization.

20011100040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55586406 (or 55586399 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20011100040 its reverse (4000111002), we get a palindrome (24011211042).

The spelling of 20011100040 in words is "twenty billion, eleven million, one hundred thousand, forty".