20662666424 has 16 divisors (see below), whose sum is σ = 39104580600. Its totient is φ = 10234778272.

The previous prime is 20662666403. The next prime is 20662666429. The reversal of 20662666424 is 42466626602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20662666429) 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, 12068459 + ... + 12070170.

Almost surely, 2^20662666424 is an apocalyptic number.

It is an amenable number.

20662666424 is a deficient number, since it is larger than the sum of its proper divisors (18441914176).

20662666424 is a wasteful number, since it uses less digits than its factorization.

20662666424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24138742 (or 24138738 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 44.

The spelling of 20662666424 in words is "twenty billion, six hundred sixty-two million, six hundred sixty-six thousand, four hundred twenty-four".