20635662156 has 24 divisors (see below), whose sum is σ = 48401977344. Its totient is φ = 6842539920.

The previous prime is 20635662121. The next prime is 20635662193. The reversal of 20635662156 is 65126653602.

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, 4499380 + ... + 4503963.

It is an arithmetic number, because the mean of its divisors is an integer number (2016749056).

Almost surely, 2^20635662156 is an apocalyptic number.

It is an amenable number.

20635662156 is an abundant number, since it is smaller than the sum of its proper divisors (27766315188).

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

20635662156 is a wasteful number, since it uses less digits than its factorization.

20635662156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9003541 (or 9003539 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 20635662156 in words is "twenty billion, six hundred thirty-five million, six hundred sixty-two thousand, one hundred fifty-six".