20636253516 has 12 divisors (see below), whose sum is σ = 48151258232. Its totient is φ = 6878751168.

The previous prime is 20636253511. The next prime is 20636253541. The reversal of 20636253516 is 61535263602.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20636253511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 859843885 + ... + 859843908.

Almost surely, 2^20636253516 is an apocalyptic number.

It is an amenable number.

20636253516 is an abundant number, since it is smaller than the sum of its proper divisors (27515004716).

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

20636253516 is a wasteful number, since it uses less digits than its factorization.

20636253516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719687800 (or 1719687798 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 39.

The spelling of 20636253516 in words is "twenty billion, six hundred thirty-six million, two hundred fifty-three thousand, five hundred sixteen".