20981232802 has 8 divisors (see below), whose sum is σ = 32322439836. Its totient is φ = 10207086192.

The previous prime is 20981232773. The next prime is 20981232859. The reversal of 20981232802 is 20823218902.

It is a Cunningham number, because it is equal to 144849²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 20981232801 + 1 = 144849^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141765013 + ... + 141765160.

Almost surely, 2^20981232802 is an apocalyptic number.

20981232802 is a deficient number, since it is larger than the sum of its proper divisors (11341207034).

20981232802 is a wasteful number, since it uses less digits than its factorization.

20981232802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283530212.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 20981232802 in words is "twenty billion, nine hundred eighty-one million, two hundred thirty-two thousand, eight hundred two".