20201331240 has 96 divisors (see below), whose sum is σ = 69109840800. Its totient is φ = 5103492480.

The previous prime is 20201331233. The next prime is 20201331253. The reversal of 20201331240 is 4213310202.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1469866 + ... + 1483545.

It is an arithmetic number, because the mean of its divisors is an integer number (719894175).

Almost surely, 2^20201331240 is an apocalyptic number.

20201331240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201331240 is an abundant number, since it is smaller than the sum of its proper divisors (48908509560).

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

20201331240 is a wasteful number, since it uses less digits than its factorization.

20201331240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953447 (or 2953440 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20201331240 its reverse (4213310202), we get a palindrome (24414641442).

The spelling of 20201331240 in words is "twenty billion, two hundred one million, three hundred thirty-one thousand, two hundred forty".