20981327602 has 4 divisors (see below), whose sum is σ = 31471991406. Its totient is φ = 10490663800.

The previous prime is 20981327567. The next prime is 20981327663. The reversal of 20981327602 is 20672318902.

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., 14854978161 + 6126349441 = 121881^2 + 78271^2 .

It is a super-2 number, since 2×20981327602² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5245331899 + ... + 5245331902.

Almost surely, 2^20981327602 is an apocalyptic number.

20981327602 is a deficient number, since it is larger than the sum of its proper divisors (10490663804).

20981327602 is a wasteful number, since it uses less digits than its factorization.

20981327602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10490663803.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 20981327602 in words is "twenty billion, nine hundred eighty-one million, three hundred twenty-seven thousand, six hundred two".