20235233643646 has 64 divisors (see below), whose sum is σ = 37380401625600. Its totient is φ = 8021196844416.

The previous prime is 20235233643641. The next prime is 20235233643661. The reversal of 20235233643646 is 64634633253202.

It is a super-2 number, since 2×20235233643646² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20235233643646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20235233643641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25562976 + ... + 26342668.

It is an arithmetic number, because the mean of its divisors is an integer number (584068775400).

Almost surely, 2^{20235233643646} is an apocalyptic number.

20235233643646 is a deficient number, since it is larger than the sum of its proper divisors (17145167981954).

20235233643646 is a wasteful number, since it uses less digits than its factorization.

20235233643646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782033.

The product of its (nonzero) digits is 11197440, while the sum is 49.

Adding to 20235233643646 its reverse (64634633253202), we get a palindrome (84869866896848).

The spelling of 20235233643646 in words is "twenty trillion, two hundred thirty-five billion, two hundred thirty-three million, six hundred forty-three thousand, six hundred forty-six".