20646652236 has 192 divisors, whose sum is σ = 59240251392. Its totient is φ = 5468145408.

The previous prime is 20646652183. The next prime is 20646652253. The reversal of 20646652236 is 63225664602.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26234235 + ... + 26235021.

It is an arithmetic number, because the mean of its divisors is an integer number (308542976).

Almost surely, 2^20646652236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20646652236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29620125696).

20646652236 is an abundant number, since it is smaller than the sum of its proper divisors (38593599156).

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

20646652236 is a wasteful number, since it uses less digits than its factorization.

20646652236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228 (or 1226 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 42.

The spelling of 20646652236 in words is "twenty billion, six hundred forty-six million, six hundred fifty-two thousand, two hundred thirty-six".