20715324240 has 80 divisors (see below), whose sum is σ = 69157323648. Its totient is φ = 5099155968.

The previous prime is 20715324229. The next prime is 20715324241. The reversal of 20715324240 is 4242351702.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20715324198 and 20715324207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20715324241) 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, 3316644 + ... + 3322883.

Almost surely, 2^20715324240 is an apocalyptic number.

20715324240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20715324240 is an abundant number, since it is smaller than the sum of its proper divisors (48441999408).

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

20715324240 is a wasteful number, since it uses less digits than its factorization.

20715324240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6639556 (or 6639550 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 30.

Adding to 20715324240 its reverse (4242351702), we get a palindrome (24957675942).

The spelling of 20715324240 in words is "twenty billion, seven hundred fifteen million, three hundred twenty-four thousand, two hundred forty".