20853397706 has 4 divisors (see below), whose sum is σ = 31280096562. Its totient is φ = 10426698852.

The previous prime is 20853397687. The next prime is 20853397727. The reversal of 20853397706 is 60779335802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17040952681 + 3812445025 = 130541^2 + 61745^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5213349425 + ... + 5213349428.

Almost surely, 2^20853397706 is an apocalyptic number.

20853397706 is a deficient number, since it is larger than the sum of its proper divisors (10426698856).

20853397706 is a wasteful number, since it uses less digits than its factorization.

20853397706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10426698855.

The product of its (nonzero) digits is 1905120, while the sum is 50.

The spelling of 20853397706 in words is "twenty billion, eight hundred fifty-three million, three hundred ninety-seven thousand, seven hundred six".