20664643203 has 12 divisors (see below), whose sum is σ = 29852139408. Its totient is φ = 13774947120.

The previous prime is 20664643189. The next prime is 20664643211. The reversal of 20664643203 is 30234646602.

20664643203 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 4 + 643 + 2 + 0 + 3 = 666.

It is not a de Polignac number, because 20664643203 - 2¹⁶ = 20664577667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20664643213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31543 + ... + 205728.

It is an arithmetic number, because the mean of its divisors is an integer number (2487678284).

Almost surely, 2^20664643203 is an apocalyptic number.

20664643203 is a deficient number, since it is larger than the sum of its proper divisors (9187496205).

20664643203 is a wasteful number, since it uses less digits than its factorization.

20664643203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246954 (or 246951 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 36.

The spelling of 20664643203 in words is "twenty billion, six hundred sixty-four million, six hundred forty-three thousand, two hundred three".