20744650187 has 4 divisors (see below), whose sum is σ = 20859261696. Its totient is φ = 20630038680.

The previous prime is 20744650183. The next prime is 20744650189. The reversal of 20744650187 is 78105644702.

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 20744650187 - 2² = 20744650183 is a prime.

It is a super-2 number, since 2×20744650187² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20744650183) 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, 57305483 + ... + 57305844.

It is an arithmetic number, because the mean of its divisors is an integer number (5214815424).

Almost surely, 2^20744650187 is an apocalyptic number.

20744650187 is a deficient number, since it is larger than the sum of its proper divisors (114611509).

20744650187 is a wasteful number, since it uses less digits than its factorization.

20744650187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114611508.

The product of its (nonzero) digits is 376320, while the sum is 44.

The spelling of 20744650187 in words is "twenty billion, seven hundred forty-four million, six hundred fifty thousand, one hundred eighty-seven".