20812384138 has 48 divisors (see below), whose sum is σ = 38697068736. Its totient is φ = 8220026880.

The previous prime is 20812384123. The next prime is 20812384189. The reversal of 20812384138 is 83148321802.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20812384138.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1509745 + ... + 1523467.

It is an arithmetic number, because the mean of its divisors is an integer number (806188932).

Almost surely, 2^20812384138 is an apocalyptic number.

20812384138 is a deficient number, since it is larger than the sum of its proper divisors (17884684598).

20812384138 is a wasteful number, since it uses less digits than its factorization.

20812384138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14399 (or 14386 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 20812384138 in words is "twenty billion, eight hundred twelve million, three hundred eighty-four thousand, one hundred thirty-eight".