20113883440 has 80 divisors (see below), whose sum is σ = 53675189568. Its totient is φ = 6866546688.

The previous prime is 20113883437. The next prime is 20113883441. The reversal of 20113883440 is 4438831102.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 20113883396 and 20113883405.

It is not an unprimeable number, because it can be changed into a prime (20113883441) 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, 53404 + ... + 207556.

Almost surely, 2^20113883440 is an apocalyptic number.

20113883440 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 20113883440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26837594784).

20113883440 is an abundant number, since it is smaller than the sum of its proper divisors (33561306128).

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

20113883440 is a wasteful number, since it uses less digits than its factorization.

20113883440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154406 (or 154400 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The spelling of 20113883440 in words is "twenty billion, one hundred thirteen million, eight hundred eighty-three thousand, four hundred forty".