20542324440 has 64 divisors (see below), whose sum is σ = 67229429760. Its totient is φ = 4979957120.

The previous prime is 20542324433. The next prime is 20542324457. The reversal of 20542324440 is 4442324502.

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 = 20542324398 and 20542324407.

It is a congruent number.

It is an unprimeable number.

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, 7779864 + ... + 7782503.

It is an arithmetic number, because the mean of its divisors is an integer number (1050459840).

Almost surely, 2^20542324440 is an apocalyptic number.

20542324440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20542324440 is an abundant number, since it is smaller than the sum of its proper divisors (46687105320).

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

20542324440 is a wasteful number, since it uses less digits than its factorization.

20542324440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15562392 (or 15562388 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 30.

Adding to 20542324440 its reverse (4442324502), we get a palindrome (24984648942).

The spelling of 20542324440 in words is "twenty billion, five hundred forty-two million, three hundred twenty-four thousand, four hundred forty".