20523413240 has 64 divisors (see below), whose sum is σ = 51547224960. Its totient is φ = 7289493120.

The previous prime is 20523413203. The next prime is 20523413243. The reversal of 20523413240 is 4231432502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523413243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 523454 + ... + 561293.

It is an arithmetic number, because the mean of its divisors is an integer number (805425390).

Almost surely, 2^20523413240 is an apocalyptic number.

20523413240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20523413240 is an abundant number, since it is smaller than the sum of its proper divisors (31023811720).

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

20523413240 is a wasteful number, since it uses less digits than its factorization.

20523413240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084812 (or 1084808 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 20523413240 its reverse (4231432502), we get a palindrome (24754845742).

The spelling of 20523413240 in words is "twenty billion, five hundred twenty-three million, four hundred thirteen thousand, two hundred forty".