20539136140 has 48 divisors (see below), whose sum is σ = 44259747840. Its totient is φ = 8001566720.

The previous prime is 20539136131. The next prime is 20539136161. The reversal of 20539136140 is 4163193502.

It is a super-2 number, since 2×20539136140² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20539136096 and 20539136105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465141 + ... + 507379.

It is an arithmetic number, because the mean of its divisors is an integer number (922078080).

Almost surely, 2^20539136140 is an apocalyptic number.

20539136140 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 20539136140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22129873920).

20539136140 is an abundant number, since it is smaller than the sum of its proper divisors (23720611700).

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

20539136140 is a wasteful number, since it uses less digits than its factorization.

20539136140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42882 (or 42880 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 20539136140 in words is "twenty billion, five hundred thirty-nine million, one hundred thirty-six thousand, one hundred forty".