20109508864 has 27 divisors (see below), whose sum is σ = 40144994463. Its totient is φ = 10053619968.

The previous prime is 20109508829. The next prime is 20109508873. The reversal of 20109508864 is 46880590102.

It is a happy number.

The square root of 20109508864 is 141808.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20109508864.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2264497 + ... + 2273359.

Almost surely, 2^20109508864 is an apocalyptic number.

20109508864 is the 141808-th square number.

It is an amenable number.

20109508864 is a deficient number, since it is larger than the sum of its proper divisors (20035485599).

20109508864 is an frugal number, since it uses more digits than its factorization.

20109508864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17742 (or 8865 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 20109508864 in words is "twenty billion, one hundred nine million, five hundred eight thousand, eight hundred sixty-four".