20109999964 has 24 divisors (see below), whose sum is σ = 36062482176. Its totient is φ = 9806592000.

The previous prime is 20109999961. The next prime is 20109999971. The reversal of 20109999964 is 46999990102.

It is a junction number, because it is equal to n+sod(n) for n = 20109999899 and 20109999908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20109999961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538044 + ... + 574204.

It is an arithmetic number, because the mean of its divisors is an integer number (1502603424).

Almost surely, 2^20109999964 is an apocalyptic number.

It is an amenable number.

20109999964 is a deficient number, since it is larger than the sum of its proper divisors (15952482212).

20109999964 is a wasteful number, since it uses less digits than its factorization.

20109999964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39597 (or 39595 counting only the distinct ones).

The product of its (nonzero) digits is 2834352, while the sum is 58.

The spelling of 20109999964 in words is "twenty billion, one hundred nine million, nine hundred ninety-nine thousand, nine hundred sixty-four".