20531040320 has 56 divisors (see below), whose sum is σ = 55873765824. Its totient is φ = 7039213056.

The previous prime is 20531040319. The next prime is 20531040323. The reversal of 20531040320 is 2304013502.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

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

It is a junction number, because it is equal to n+sod(n) for n = 20531040292 and 20531040301.

It is not an unprimeable number, because it can be changed into a prime (20531040323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4580582 + ... + 4585061.

Almost surely, 2^20531040320 is an apocalyptic number.

20531040320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20531040320 is an abundant number, since it is smaller than the sum of its proper divisors (35342725504).

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

20531040320 is an equidigital number, since it uses as much as digits as its factorization.

20531040320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9165667 (or 9165657 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 20531040320 its reverse (2304013502), we get a palindrome (22835053822).

The spelling of 20531040320 in words is "twenty billion, five hundred thirty-one million, forty thousand, three hundred twenty".