20857714878 has 128 divisors (see below), whose sum is σ = 56420582400. Its totient is φ = 4964152320.

The previous prime is 20857714847. The next prime is 20857714897. The reversal of 20857714878 is 87841775802.

It is a super-3 number, since 3×20857714878³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 810148 + ... + 835496.

It is an arithmetic number, because the mean of its divisors is an integer number (440785800).

Almost surely, 2^20857714878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20857714878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28210291200).

20857714878 is an abundant number, since it is smaller than the sum of its proper divisors (35562867522).

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

20857714878 is a wasteful number, since it uses less digits than its factorization.

20857714878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25522.

The product of its (nonzero) digits is 7024640, while the sum is 57.

The spelling of 20857714878 in words is "twenty billion, eight hundred fifty-seven million, seven hundred fourteen thousand, eight hundred seventy-eight".