20666154583 has 4 divisors (see below), whose sum is σ = 20742413728. Its totient is φ = 20589895440.

The previous prime is 20666154581. The next prime is 20666154611. The reversal of 20666154583 is 38545166602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20666154583 - 2¹ = 20666154581 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 (20666154581) 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, 38129166 + ... + 38129707.

It is an arithmetic number, because the mean of its divisors is an integer number (5185603432).

Almost surely, 2^20666154583 is an apocalyptic number.

20666154583 is a deficient number, since it is larger than the sum of its proper divisors (76259145).

20666154583 is an equidigital number, since it uses as much as digits as its factorization.

20666154583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76259144.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 20666154583 in words is "twenty billion, six hundred sixty-six million, one hundred fifty-four thousand, five hundred eighty-three".