20666863954 has 8 divisors (see below), whose sum is σ = 33818504688. Its totient is φ = 9394029060.

The previous prime is 20666863907. The next prime is 20666863957. The reversal of 20666863954 is 45936866602.

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

It is a junction number, because it is equal to n+sod(n) for n = 20666863895 and 20666863904.

It is not an unprimeable number, because it can be changed into a prime (20666863957) 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 3 ways as a sum of consecutive naturals, for example, 469701432 + ... + 469701475.

It is an arithmetic number, because the mean of its divisors is an integer number (4227313086).

Almost surely, 2^20666863954 is an apocalyptic number.

20666863954 is a deficient number, since it is larger than the sum of its proper divisors (13151640734).

20666863954 is a wasteful number, since it uses less digits than its factorization.

20666863954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939402920.

The product of its (nonzero) digits is 11197440, while the sum is 55.

The spelling of 20666863954 in words is "twenty billion, six hundred sixty-six million, eight hundred sixty-three thousand, nine hundred fifty-four".