20782415136 has 96 divisors (see below), whose sum is σ = 66014766720. Its totient is φ = 5588545536.

The previous prime is 20782415117. The next prime is 20782415161. The reversal of 20782415136 is 63151428702.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 20782415094 and 20782415103.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 898171 + ... + 921018.

It is an arithmetic number, because the mean of its divisors is an integer number (687653820).

Almost surely, 2^20782415136 is an apocalyptic number.

It is an amenable number.

20782415136 is an abundant number, since it is smaller than the sum of its proper divisors (45232351584).

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

20782415136 is a wasteful number, since it uses less digits than its factorization.

20782415136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819226 (or 1819218 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 20782415136 in words is "twenty billion, seven hundred eighty-two million, four hundred fifteen thousand, one hundred thirty-six".