20115635556 has 24 divisors (see below), whose sum is σ = 47039201440. Its totient is φ = 6690537792.

The previous prime is 20115635531. The next prime is 20115635569. The reversal of 20115635556 is 65553651102.

It is a super-2 number, since 2×20115635556² (a number of 21 digits) contains 22 as substring.

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, 1828546 + ... + 1839513.

Almost surely, 2^20115635556 is an apocalyptic number.

It is an amenable number.

20115635556 is an abundant number, since it is smaller than the sum of its proper divisors (26923565884).

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

20115635556 is a wasteful number, since it uses less digits than its factorization.

20115635556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668523 (or 3668521 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 39.

The spelling of 20115635556 in words is "twenty billion, one hundred fifteen million, six hundred thirty-five thousand, five hundred fifty-six".