20136521860 has 96 divisors (see below), whose sum is σ = 54784477440. Its totient is φ = 6037452288.

The previous prime is 20136521843. The next prime is 20136521861. The reversal of 20136521860 is 6812563102.

It is not an unprimeable number, because it can be changed into a prime (20136521861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256579 + ... + 325738.

It is an arithmetic number, because the mean of its divisors is an integer number (570671640).

Almost surely, 2^20136521860 is an apocalyptic number.

20136521860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20136521860 is an abundant number, since it is smaller than the sum of its proper divisors (34647955580).

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

20136521860 is a wasteful number, since it uses less digits than its factorization.

20136521860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582365 (or 582363 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 20136521860 in words is "twenty billion, one hundred thirty-six million, five hundred twenty-one thousand, eight hundred sixty".