20542836720 has 480 divisors, whose sum is σ = 80034163200. Its totient is φ = 4263985152.

The previous prime is 20542836697. The next prime is 20542836763. The reversal of 20542836720 is 2763824502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14079351 + ... + 14080809.

It is an arithmetic number, because the mean of its divisors is an integer number (166737840).

Almost surely, 2^20542836720 is an apocalyptic number.

20542836720 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 20542836720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40017081600).

20542836720 is an abundant number, since it is smaller than the sum of its proper divisors (59491326480).

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

20542836720 is a wasteful number, since it uses less digits than its factorization.

20542836720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545 (or 1522 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 20542836720 in words is "twenty billion, five hundred forty-two million, eight hundred thirty-six thousand, seven hundred twenty".