20015312240 has 200 divisors, whose sum is σ = 59229856368. Its totient is φ = 6237880320.

The previous prime is 20015312237. The next prime is 20015312243. The reversal of 20015312240 is 4221351002.

It is an interprime number because it is at equal distance from previous prime (20015312237) and next prime (20015312243).

It is a super-2 number, since 2×20015312240² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20015312243) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2108144 + ... + 2117616.

Almost surely, 2^20015312240 is an apocalyptic number.

20015312240 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 20015312240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29614928184).

20015312240 is an abundant number, since it is smaller than the sum of its proper divisors (39214544128).

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

20015312240 is an equidigital number, since it uses as much as digits as its factorization.

20015312240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9525 (or 9498 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20015312240 its reverse (4221351002), we get a palindrome (24236663242).

The spelling of 20015312240 in words is "twenty billion, fifteen million, three hundred twelve thousand, two hundred forty".