20857715076 has 72 divisors (see below), whose sum is σ = 53742082464. Its totient is φ = 6244096640.

The previous prime is 20857715057. The next prime is 20857715077. The reversal of 20857715076 is 67051775802.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20857715077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 897880 + ... + 920816.

It is an arithmetic number, because the mean of its divisors is an integer number (746417812).

Almost surely, 2^20857715076 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20857715076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26871041232).

20857715076 is an abundant number, since it is smaller than the sum of its proper divisors (32884367388).

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

20857715076 is a wasteful number, since it uses less digits than its factorization.

20857715076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23121 (or 23036 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 48.

The spelling of 20857715076 in words is "twenty billion, eight hundred fifty-seven million, seven hundred fifteen thousand, seventy-six".