20513533700 has 144 divisors (see below), whose sum is σ = 49196851200. Its totient is φ = 7362576000.

The previous prime is 20513533679. The next prime is 20513533811. The reversal of 20513533700 is 733531502.

It is a super-2 number, since 2×20513533700² (a number of 21 digits) contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 34246001 + ... + 34246599.

It is an arithmetic number, because the mean of its divisors is an integer number (341644800).

Almost surely, 2^20513533700 is an apocalyptic number.

20513533700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20513533700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24598425600).

20513533700 is an abundant number, since it is smaller than the sum of its proper divisors (28683317500).

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

20513533700 is a wasteful number, since it uses less digits than its factorization.

20513533700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 29.

The spelling of 20513533700 in words is "twenty billion, five hundred thirteen million, five hundred thirty-three thousand, seven hundred".