20665253416 has 8 divisors (see below), whose sum is σ = 38747350170. Its totient is φ = 10332626704.

The previous prime is 20665253393. The next prime is 20665253459. The reversal of 20665253416 is 61435256602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20662912516 + 2340900 = 143746^2 + 1530^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1291578331 + ... + 1291578346.

Almost surely, 2^20665253416 is an apocalyptic number.

It is an amenable number.

20665253416 is a deficient number, since it is larger than the sum of its proper divisors (18082096754).

20665253416 is a wasteful number, since it uses less digits than its factorization.

20665253416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583156683 (or 2583156679 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 20665253416 in words is "twenty billion, six hundred sixty-five million, two hundred fifty-three thousand, four hundred sixteen".