20872021807 has 32 divisors (see below), whose sum is σ = 26861893632. Its totient is φ = 15762916224.

The previous prime is 20872021783. The next prime is 20872021817. The reversal of 20872021807 is 70812027802.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20872021807 - 2²³ = 20863633199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20872021817) 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, 1009053 + ... + 1029529.

It is an arithmetic number, because the mean of its divisors is an integer number (839434176).

Almost surely, 2^20872021807 is an apocalyptic number.

20872021807 is a deficient number, since it is larger than the sum of its proper divisors (5989871825).

20872021807 is a wasteful number, since it uses less digits than its factorization.

20872021807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21007.

The product of its (nonzero) digits is 25088, while the sum is 37.

The spelling of 20872021807 in words is "twenty billion, eight hundred seventy-two million, twenty-one thousand, eight hundred seven".