20664611541 has 20 divisors (see below), whose sum is σ = 35279267232. Its totient is φ = 11808349128.

The previous prime is 20664611521. The next prime is 20664611567. The reversal of 20664611541 is 14511646602.

20664611541 is a `hidden beast` number, since 2 + 0 + 6 + 646 + 1 + 1 + 5 + 4 + 1 = 666.

It is not a de Polignac number, because 20664611541 - 2⁹ = 20664611029 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20664611496 and 20664611505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664611521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18222195 + ... + 18223328.

Almost surely, 2^20664611541 is an apocalyptic number.

20664611541 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20664611541 is a deficient number, since it is larger than the sum of its proper divisors (14614655691).

20664611541 is an equidigital number, since it uses as much as digits as its factorization.

20664611541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36445542 (or 36445533 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 20664611541 in words is "twenty billion, six hundred sixty-four million, six hundred eleven thousand, five hundred forty-one".