20320514136 has 576 divisors, whose sum is σ = 68314428000. Its totient is φ = 5399654400.

The previous prime is 20320514119. The next prime is 20320514141. The reversal of 20320514136 is 63141502302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 495622276 + ... + 495622316.

Almost surely, 2^20320514136 is an apocalyptic number.

20320514136 is a gapful number since it is divisible by the number (26) 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 20320514136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34157214000).

20320514136 is an abundant number, since it is smaller than the sum of its proper divisors (47993913864).

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

20320514136 is a wasteful number, since it uses less digits than its factorization.

20320514136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The spelling of 20320514136 in words is "twenty billion, three hundred twenty million, five hundred fourteen thousand, one hundred thirty-six".