20402202666464 has 24 divisors (see below), whose sum is σ = 40278721860720. Its totient is φ = 10172686003456.

The previous prime is 20402202666457. The next prime is 20402202666467. The reversal of 20402202666464 is 46466620220402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402202666467) 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, 887967389 + ... + 887990364.

It is an arithmetic number, because the mean of its divisors is an integer number (1678280077530).

Almost surely, 2^{20402202666464} is an apocalyptic number.

It is an amenable number.

20402202666464 is a deficient number, since it is larger than the sum of its proper divisors (19876519194256).

20402202666464 is a wasteful number, since it uses less digits than its factorization.

20402202666464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775958122 (or 1775958114 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 44.

Adding to 20402202666464 its reverse (46466620220402), we get a palindrome (66868822886866).

The spelling of 20402202666464 in words is "twenty trillion, four hundred two billion, two hundred two million, six hundred sixty-six thousand, four hundred sixty-four".