20663655545 has 32 divisors (see below), whose sum is σ = 27266803200. Its totient is φ = 14940946944.

The previous prime is 20663655539. The next prime is 20663655557. The reversal of 20663655545 is 54555636602.

It is a cyclic number.

It is not a de Polignac number, because 20663655545 - 2¹⁰ = 20663654521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20663655545.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 578516 + ... + 613194.

It is an arithmetic number, because the mean of its divisors is an integer number (852087600).

Almost surely, 2^20663655545 is an apocalyptic number.

It is an amenable number.

20663655545 is a deficient number, since it is larger than the sum of its proper divisors (6603147655).

20663655545 is a wasteful number, since it uses less digits than its factorization.

20663655545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34889.

The product of its (nonzero) digits is 3240000, while the sum is 47.

The spelling of 20663655545 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, five hundred forty-five".