20533400400 has 60 divisors (see below), whose sum is σ = 65775329792. Its totient is φ = 5475573120.

The previous prime is 20533400387. The next prime is 20533400449. The reversal of 20533400400 is 400433502.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

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 11 ways as a sum of consecutive naturals, for example, 8554384 + ... + 8556783.

Almost surely, 2^20533400400 is an apocalyptic number.

20533400400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20533400400 is an abundant number, since it is smaller than the sum of its proper divisors (45241929392).

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

20533400400 is a wasteful number, since it uses less digits than its factorization.

20533400400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17111188 (or 17111177 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

Adding to 20533400400 its reverse (400433502), we get a palindrome (20933833902).

The spelling of 20533400400 in words is "twenty billion, five hundred thirty-three million, four hundred thousand, four hundred".