20653543261 has 16 divisors (see below), whose sum is σ = 23055943680. Its totient is φ = 18372533760.

The previous prime is 20653543259. The next prime is 20653543271. The reversal of 20653543261 is 16234535602.

It is a cyclic number.

It is not a de Polignac number, because 20653543261 - 2¹ = 20653543259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20653543261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20653543241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10900 + ... + 203533.

It is an arithmetic number, because the mean of its divisors is an integer number (1440996480).

Almost surely, 2^20653543261 is an apocalyptic number.

It is an amenable number.

20653543261 is a deficient number, since it is larger than the sum of its proper divisors (2402400419).

20653543261 is a wasteful number, since it uses less digits than its factorization.

20653543261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214716.

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 20653543261 in words is "twenty billion, six hundred fifty-three million, five hundred forty-three thousand, two hundred sixty-one".