20403024240 has 160 divisors (see below), whose sum is σ = 65763648000. Its totient is φ = 5226439680.

The previous prime is 20403024203. The next prime is 20403024307. The reversal of 20403024240 is 4242030402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1377675 + ... + 1392405.

It is an arithmetic number, because the mean of its divisors is an integer number (411022800).

Almost surely, 2^20403024240 is an apocalyptic number.

20403024240 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 20403024240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32881824000).

20403024240 is an abundant number, since it is smaller than the sum of its proper divisors (45360623760).

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

20403024240 is a wasteful number, since it uses less digits than its factorization.

20403024240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14975 (or 14969 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

Adding to 20403024240 its reverse (4242030402), we get a palindrome (24645054642).

The spelling of 20403024240 in words is "twenty billion, four hundred three million, twenty-four thousand, two hundred forty".