20866509149 has 8 divisors (see below), whose sum is σ = 21161405952. Its totient is φ = 20573546560.

The previous prime is 20866509119. The next prime is 20866509199. The reversal of 20866509149 is 94190566802.

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 20866509149 - 2²⁸ = 20598073693 is a prime.

It is a super-2 number, since 2×20866509149² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20866509097 and 20866509106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866509119) 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, 461819 + ... + 504984.

It is an arithmetic number, because the mean of its divisors is an integer number (2645175744).

Almost surely, 2^20866509149 is an apocalyptic number.

It is an amenable number.

20866509149 is a deficient number, since it is larger than the sum of its proper divisors (294896803).

20866509149 is a wasteful number, since it uses less digits than its factorization.

20866509149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967107.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 20866509149 in words is "twenty billion, eight hundred sixty-six million, five hundred nine thousand, one hundred forty-nine".