20663655406 has 8 divisors (see below), whose sum is σ = 31033238904. Its totient is φ = 10319242440.

The previous prime is 20663655403. The next prime is 20663655407. The reversal of 20663655406 is 60455636602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663655403) 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, 6290580 + ... + 6293863.

It is an arithmetic number, because the mean of its divisors is an integer number (3879154863).

Almost surely, 2^20663655406 is an apocalyptic number.

20663655406 is a deficient number, since it is larger than the sum of its proper divisors (10369583498).

20663655406 is a wasteful number, since it uses less digits than its factorization.

20663655406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12585266.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 20663655406 in words is "twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, four hundred six".