20402644552 has 8 divisors (see below), whose sum is σ = 38254958550. Its totient is φ = 10201322272.

The previous prime is 20402644541. The next prime is 20402644583. The reversal of 20402644552 is 25544620402.

It can be written as a sum of positive squares in only one way, i.e., 16906760676 + 3495883876 = 130026^2 + 59126^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275165277 + ... + 1275165292.

Almost surely, 2^20402644552 is an apocalyptic number.

It is an amenable number.

20402644552 is a deficient number, since it is larger than the sum of its proper divisors (17852313998).

20402644552 is a wasteful number, since it uses less digits than its factorization.

20402644552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550330575 (or 2550330571 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 34.

The spelling of 20402644552 in words is "twenty billion, four hundred two million, six hundred forty-four thousand, five hundred fifty-two".