20511667484 has 96 divisors (see below), whose sum is σ = 45573749760. Its totient is φ = 7845465600.

The previous prime is 20511667481. The next prime is 20511667507. The reversal of 20511667484 is 48476611502.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511667481) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 18167432 + ... + 18168560.

It is an arithmetic number, because the mean of its divisors is an integer number (474726560).

Almost surely, 2^20511667484 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20511667484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22786874880).

20511667484 is an abundant number, since it is smaller than the sum of its proper divisors (25062082276).

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

20511667484 is a wasteful number, since it uses less digits than its factorization.

20511667484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179 (or 2177 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 20511667484 in words is "twenty billion, five hundred eleven million, six hundred sixty-seven thousand, four hundred eighty-four".