20524320440 has 32 divisors (see below), whose sum is σ = 49732008480. Its totient is φ = 7578210432.

The previous prime is 20524320389. The next prime is 20524320449. The reversal of 20524320440 is 4402342502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20524320449) 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, 19734404 + ... + 19735443.

It is an arithmetic number, because the mean of its divisors is an integer number (1554125265).

Almost surely, 2^20524320440 is an apocalyptic number.

20524320440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20524320440 is an abundant number, since it is smaller than the sum of its proper divisors (29207688040).

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

20524320440 is a wasteful number, since it uses less digits than its factorization.

20524320440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39469871 (or 39469867 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

Adding to 20524320440 its reverse (4402342502), we get a palindrome (24926662942).

The spelling of 20524320440 in words is "twenty billion, five hundred twenty-four million, three hundred twenty thousand, four hundred forty".