20857715060 has 96 divisors (see below), whose sum is σ = 54714105600. Its totient is φ = 6502560768.

The previous prime is 20857715057. The next prime is 20857715077. The reversal of 20857715060 is 6051775802.

It is a junction number, because it is equal to n+sod(n) for n = 20857714999 and 20857715017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36416 + ... + 207464.

It is an arithmetic number, because the mean of its divisors is an integer number (569938600).

Almost surely, 2^20857715060 is an apocalyptic number.

20857715060 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 20857715060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27357052800).

20857715060 is an abundant number, since it is smaller than the sum of its proper divisors (33856390540).

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

20857715060 is a wasteful number, since it uses less digits than its factorization.

20857715060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171145 (or 171143 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 41.

The spelling of 20857715060 in words is "twenty billion, eight hundred fifty-seven million, seven hundred fifteen thousand, sixty".