20366666687 has 8 divisors (see below), whose sum is σ = 20952060000. Its totient is φ = 19783112544.

The previous prime is 20366666629. The next prime is 20366666701. The reversal of 20366666687 is 78666666302.

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

It is a cyclic number.

It is not a de Polignac number, because 20366666687 - 2¹⁸ = 20366404543 is a prime.

It is a super-2 number, since 2×20366666687² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20366660687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437312 + ... + 481637.

It is an arithmetic number, because the mean of its divisors is an integer number (2619007500).

Almost surely, 2^20366666687 is an apocalyptic number.

20366666687 is a deficient number, since it is larger than the sum of its proper divisors (585393313).

20366666687 is an equidigital number, since it uses as much as digits as its factorization.

20366666687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919585.

The product of its (nonzero) digits is 15676416, while the sum is 56.

The spelling of 20366666687 in words is "twenty billion, three hundred sixty-six million, six hundred sixty-six thousand, six hundred eighty-seven".