20266235646 has 8 divisors (see below), whose sum is σ = 40532471304. Its totient is φ = 6755411880.

The previous prime is 20266235629. The next prime is 20266235707. The reversal of 20266235646 is 64653266202.

It is a sphenic number, since it is the product of 3 distinct primes.

20266235646 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20266235598 and 20266235607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1688852965 + ... + 1688852976.

It is an arithmetic number, because the mean of its divisors is an integer number (5066558913).

Almost surely, 2^20266235646 is an apocalyptic number.

20266235646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20266235646 is a wasteful number, since it uses less digits than its factorization.

20266235646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377705946.

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

The spelling of 20266235646 in words is "twenty billion, two hundred sixty-six million, two hundred thirty-five thousand, six hundred forty-six".