20591384820 has 48 divisors (see below), whose sum is σ = 59515749888. Its totient is φ = 5313905280.

The previous prime is 20591384813. The next prime is 20591384833. The reversal of 20591384820 is 2848319502.

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, 5533459 + ... + 5537178.

It is an arithmetic number, because the mean of its divisors is an integer number (1239911456).

Almost surely, 2^20591384820 is an apocalyptic number.

20591384820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20591384820 is an abundant number, since it is smaller than the sum of its proper divisors (38924365068).

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

20591384820 is a wasteful number, since it uses less digits than its factorization.

20591384820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11070680 (or 11070678 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 20591384820 in words is "twenty billion, five hundred ninety-one million, three hundred eighty-four thousand, eight hundred twenty".