20702206216 has 8 divisors (see below), whose sum is σ = 38816636670. Its totient is φ = 10351103104.

The previous prime is 20702206211. The next prime is 20702206247. The reversal of 20702206216 is 61260220702.

It can be written as a sum of positive squares in only one way, i.e., 14171950116 + 6530256100 = 119046^2 + 80810^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20702206211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1293887881 + ... + 1293887896.

Almost surely, 2^20702206216 is an apocalyptic number.

It is an amenable number.

20702206216 is a deficient number, since it is larger than the sum of its proper divisors (18114430454).

20702206216 is a wasteful number, since it uses less digits than its factorization.

20702206216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587775783 (or 2587775779 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

Adding to 20702206216 its reverse (61260220702), we get a palindrome (81962426918).

The spelling of 20702206216 in words is "twenty billion, seven hundred two million, two hundred six thousand, two hundred sixteen".