20113331440 has 20 divisors (see below), whose sum is σ = 46763495784. Its totient is φ = 8045332544.

The previous prime is 20113331423. The next prime is 20113331453. The reversal of 20113331440 is 4413331102.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×20113331440² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125708242 + ... + 125708401.

Almost surely, 2^20113331440 is an apocalyptic number.

20113331440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20113331440 is an abundant number, since it is smaller than the sum of its proper divisors (26650164344).

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

20113331440 is a wasteful number, since it uses less digits than its factorization.

20113331440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251416656 (or 251416650 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 20113331440 its reverse (4413331102), we get a palindrome (24526662542).

The spelling of 20113331440 in words is "twenty billion, one hundred thirteen million, three hundred thirty-one thousand, four hundred forty".