20112065478 has 64 divisors (see below), whose sum is σ = 47093875200. Its totient is φ = 6344684640.

The previous prime is 20112065473. The next prime is 20112065549. The reversal of 20112065478 is 87456021102.

20112065478 is a `hidden beast` number, since 2 + 0 + 1 + 120 + 65 + 478 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112065473) 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, 1048300 + ... + 1067312.

It is an arithmetic number, because the mean of its divisors is an integer number (735841800).

Almost surely, 2^20112065478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20112065478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23546937600).

20112065478 is an abundant number, since it is smaller than the sum of its proper divisors (26981809722).

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

20112065478 is a wasteful number, since it uses less digits than its factorization.

20112065478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20074 (or 20068 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 20112065478 in words is "twenty billion, one hundred twelve million, sixty-five thousand, four hundred seventy-eight".