20261181652 has 6 divisors (see below), whose sum is σ = 35457067898. Its totient is φ = 10130590824.

The previous prime is 20261181649. The next prime is 20261181667. The reversal of 20261181652 is 25618116202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20196957456 + 64224196 = 142116^2 + 8014^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2532647703 + ... + 2532647710.

Almost surely, 2^20261181652 is an apocalyptic number.

It is an amenable number.

20261181652 is a deficient number, since it is larger than the sum of its proper divisors (15195886246).

20261181652 is a wasteful number, since it uses less digits than its factorization.

20261181652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5065295417 (or 5065295415 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

Adding to 20261181652 its reverse (25618116202), we get a palindrome (45879297854).

The spelling of 20261181652 in words is "twenty billion, two hundred sixty-one million, one hundred eighty-one thousand, six hundred fifty-two".