20806277782 has 16 divisors (see below), whose sum is σ = 31267328400. Its totient is φ = 10383851520.

The previous prime is 20806277777. The next prime is 20806277801. The reversal of 20806277782 is 28777260802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4640982 + ... + 4645462.

It is an arithmetic number, because the mean of its divisors is an integer number (1954208025).

Almost surely, 2^20806277782 is an apocalyptic number.

20806277782 is a deficient number, since it is larger than the sum of its proper divisors (10461050618).

20806277782 is a wasteful number, since it uses less digits than its factorization.

20806277782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8271.

The product of its (nonzero) digits is 1053696, while the sum is 49.

The spelling of 20806277782 in words is "twenty billion, eight hundred six million, two hundred seventy-seven thousand, seven hundred eighty-two".