20609755668 has 60 divisors (see below), whose sum is σ = 55615998592. Its totient is φ = 6648305040.

The previous prime is 20609755603. The next prime is 20609755703. The reversal of 20609755668 is 86655790602.

It is a happy number.

20609755668 is a `hidden beast` number, since 2 + 0 + 6 + 0 + 9 + 75 + 566 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1015930 + ... + 1036017.

Almost surely, 2^20609755668 is an apocalyptic number.

It is an amenable number.

20609755668 is an abundant number, since it is smaller than the sum of its proper divisors (35006242924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20609755668 is a wasteful number, since it uses less digits than its factorization.

20609755668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051994 (or 2051983 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 20609755668 in words is "twenty billion, six hundred nine million, seven hundred fifty-five thousand, six hundred sixty-eight".