20468031661 has 16 divisors (see below), whose sum is σ = 25573984128. Its totient is φ = 15914491200.

The previous prime is 20468031659. The next prime is 20468031719. The reversal of 20468031661 is 16613086402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20468031661 - 2¹ = 20468031659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20468031661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20468031611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252810 + ... + 323803.

It is an arithmetic number, because the mean of its divisors is an integer number (1598374008).

Almost surely, 2^20468031661 is an apocalyptic number.

It is an amenable number.

20468031661 is a deficient number, since it is larger than the sum of its proper divisors (5105952467).

20468031661 is a wasteful number, since it uses less digits than its factorization.

20468031661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577092.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 20468031661 in words is "twenty billion, four hundred sixty-eight million, thirty-one thousand, six hundred sixty-one".