20708861388602 has 4 divisors (see below), whose sum is σ = 31063292082906. Its totient is φ = 10354430694300.

The previous prime is 20708861388497. The next prime is 20708861388629. The reversal of 20708861388602 is 20688316880702.

It is a Cunningham number, because it is equal to 4550699²+1.

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., 20708861388601 + 1 = 4550699^2 + 1^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5177215347149 + ... + 5177215347152.

Almost surely, 2^{20708861388602} is an apocalyptic number.

20708861388602 is a deficient number, since it is larger than the sum of its proper divisors (10354430694304).

20708861388602 is a wasteful number, since it uses less digits than its factorization.

20708861388602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10354430694303.

The product of its (nonzero) digits is 12386304, while the sum is 59.

The spelling of 20708861388602 in words is "twenty trillion, seven hundred eight billion, eight hundred sixty-one million, three hundred eighty-eight thousand, six hundred two".