20635145660 has 48 divisors (see below), whose sum is σ = 45166098432. Its totient is φ = 7910222400.

The previous prime is 20635145653. The next prime is 20635145731. The reversal of 20635145660 is 6654153602.

It is a happy number.

It is a super-4 number, since 4×20635145660⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97706 + ... + 225425.

It is an arithmetic number, because the mean of its divisors is an integer number (940960384).

Almost surely, 2^20635145660 is an apocalyptic number.

20635145660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20635145660 is an abundant number, since it is smaller than the sum of its proper divisors (24530952772).

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

20635145660 is a wasteful number, since it uses less digits than its factorization.

20635145660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323274 (or 323272 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 20635145660 in words is "twenty billion, six hundred thirty-five million, one hundred forty-five thousand, six hundred sixty".