20533135440 has 40 divisors (see below), whose sum is σ = 63652720608. Its totient is φ = 5475502720.

The previous prime is 20533135429. The next prime is 20533135477. The reversal of 20533135440 is 4453133502.

It is a tau number, because it is divible by the number of its divisors (40).

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 = 20533135398 and 20533135407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42777126 + ... + 42777605.

Almost surely, 2^20533135440 is an apocalyptic number.

20533135440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20533135440 is an abundant number, since it is smaller than the sum of its proper divisors (43119585168).

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

20533135440 is a wasteful number, since it uses less digits than its factorization.

20533135440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85554747 (or 85554741 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 20533135440 its reverse (4453133502), we get a palindrome (24986268942).

The spelling of 20533135440 in words is "twenty billion, five hundred thirty-three million, one hundred thirty-five thousand, four hundred forty".