20203102440 has 96 divisors (see below), whose sum is σ = 65910049920. Its totient is φ = 5366984064.

The previous prime is 20203102429. The next prime is 20203102441. The reversal of 20203102440 is 4420130202.

20203102440 is a `hidden beast` number, since 20 + 203 + 1 + 0 + 2 + 440 = 666.

It is a super-2 number, since 2×20203102440² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20203102441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12012 + ... + 201371.

It is an arithmetic number, because the mean of its divisors is an integer number (686563020).

Almost surely, 2^20203102440 is an apocalyptic number.

20203102440 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 20203102440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32955024960).

20203102440 is an abundant number, since it is smaller than the sum of its proper divisors (45706947480).

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

20203102440 is a wasteful number, since it uses less digits than its factorization.

20203102440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213663 (or 213656 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20203102440 its reverse (4420130202), we get a palindrome (24623232642).

The spelling of 20203102440 in words is "twenty billion, two hundred three million, one hundred two thousand, four hundred forty".