20747555608 has 32 divisors (see below), whose sum is σ = 43338733200. Its totient is φ = 9245593728.

The previous prime is 20747555573. The next prime is 20747555617. The reversal of 20747555608 is 80655574702.

It is a happy number.

It is a super-2 number, since 2×20747555608² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3436566 + ... + 3442597.

Almost surely, 2^20747555608 is an apocalyptic number.

It is an amenable number.

20747555608 is an abundant number, since it is smaller than the sum of its proper divisors (22591177592).

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

20747555608 is a wasteful number, since it uses less digits than its factorization.

20747555608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6879211 (or 6879207 counting only the distinct ones).

The product of its (nonzero) digits is 2352000, while the sum is 49.

The spelling of 20747555608 in words is "twenty billion, seven hundred forty-seven million, five hundred fifty-five thousand, six hundred eight".