20851380012 has 48 divisors (see below), whose sum is σ = 48817641600. Its totient is φ = 6927011712.

The previous prime is 20851379999. The next prime is 20851380019. The reversal of 20851380012 is 21008315802.

It is not an unprimeable number, because it can be changed into a prime (20851380019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5876823 + ... + 5880369.

It is an arithmetic number, because the mean of its divisors is an integer number (1017034200).

Almost surely, 2^20851380012 is an apocalyptic number.

It is an amenable number.

20851380012 is an abundant number, since it is smaller than the sum of its proper divisors (27966261588).

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

20851380012 is a wasteful number, since it uses less digits than its factorization.

20851380012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5070 (or 5068 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

Adding to 20851380012 its reverse (21008315802), we get a palindrome (41859695814).

The spelling of 20851380012 in words is "twenty billion, eight hundred fifty-one million, three hundred eighty thousand, twelve".