20200013440 has 128 divisors (see below), whose sum is σ = 49660128000. Its totient is φ = 7853273088.

The previous prime is 20200013413. The next prime is 20200013441. The reversal of 20200013440 is 4431000202.

It is a tau number, because it is divible by the number of its divisors (128).

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 (20200013441) 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, 4479667 + ... + 4484173.

It is an arithmetic number, because the mean of its divisors is an integer number (387969750).

Almost surely, 2^20200013440 is an apocalyptic number.

20200013440 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 20200013440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24830064000).

20200013440 is an abundant number, since it is smaller than the sum of its proper divisors (29460114560).

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

20200013440 is a wasteful number, since it uses less digits than its factorization.

20200013440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4722 (or 4710 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20200013440 its reverse (4431000202), we get a palindrome (24631013642).

The spelling of 20200013440 in words is "twenty billion, two hundred million, thirteen thousand, four hundred forty".