20518080000 has 800 divisors, whose sum is σ = 78234456960. Its totient is φ = 4730880000.

The previous prime is 20518079983. The next prime is 20518080001. The reversal of 20518080000 is 8081502.

It is a tau number, because it is divible by the number of its divisors (800).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20518080001) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 306239967 + ... + 306240033.

Almost surely, 2^20518080000 is an apocalyptic number.

20518080000 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 20518080000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39117228480).

20518080000 is an abundant number, since it is smaller than the sum of its proper divisors (57716376960).

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

20518080000 is an equidigital number, since it uses as much as digits as its factorization.

20518080000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The spelling of 20518080000 in words is "twenty billion, five hundred eighteen million, eighty thousand".