20681031706 has 4 divisors (see below), whose sum is σ = 31021547562. Its totient is φ = 10340515852.

The previous prime is 20681031703. The next prime is 20681031719. The reversal of 20681031706 is 60713018602.

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., 12267556081 + 8413475625 = 110759^2 + 91725^2 .

It is not an unprimeable number, because it can be changed into a prime (20681031703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5170257925 + ... + 5170257928.

Almost surely, 2^20681031706 is an apocalyptic number.

20681031706 is a deficient number, since it is larger than the sum of its proper divisors (10340515856).

20681031706 is a wasteful number, since it uses less digits than its factorization.

20681031706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10340515855.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 20681031706 in words is "twenty billion, six hundred eighty-one million, thirty-one thousand, seven hundred six".