20661706008 has 24 divisors (see below), whose sum is σ = 55958787300. Its totient is φ = 6887235312.

The previous prime is 20661706001. The next prime is 20661706027. The reversal of 20661706008 is 80060716602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×20661706008² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20661706001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143483998 + ... + 143484141.

Almost surely, 2^20661706008 is an apocalyptic number.

It is an amenable number.

20661706008 is an abundant number, since it is smaller than the sum of its proper divisors (35297081292).

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

20661706008 is a wasteful number, since it uses less digits than its factorization.

20661706008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286968151 (or 286968144 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 20661706008 in words is "twenty billion, six hundred sixty-one million, seven hundred six thousand, eight".