20663530434999 has 16 divisors (see below), whose sum is σ = 32223829139200. Its totient is φ = 13050650800728.

The previous prime is 20663530434991. The next prime is 20663530435001. The reversal of 20663530434999 is 99943403536602.

20663530434999 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 3 + 530 + 4 + 3 + 4 + 9 + 99 = 666.

It is not a de Polignac number, because 20663530434999 - 2³ = 20663530434991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663530434991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20139892699 + ... + 20139893724.

It is an arithmetic number, because the mean of its divisors is an integer number (2013989321200).

Almost surely, 2^{20663530434999} is an apocalyptic number.

20663530434999 is a deficient number, since it is larger than the sum of its proper divisors (11560298704201).

20663530434999 is a wasteful number, since it uses less digits than its factorization.

20663530434999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40279786451 (or 40279786445 counting only the distinct ones).

The product of its (nonzero) digits is 113374080, while the sum is 63.

The spelling of 20663530434999 in words is "twenty trillion, six hundred sixty-three billion, five hundred thirty million, four hundred thirty-four thousand, nine hundred ninety-nine".