20543045651 has 4 divisors (see below), whose sum is σ = 21624258600. Its totient is φ = 19461832704.

The previous prime is 20543045647. The next prime is 20543045657. The reversal of 20543045651 is 15654034502.

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 20543045651 - 2² = 20543045647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20543045657) 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, 540606446 + ... + 540606483.

It is an arithmetic number, because the mean of its divisors is an integer number (5406064650).

Almost surely, 2^20543045651 is an apocalyptic number.

20543045651 is a deficient number, since it is larger than the sum of its proper divisors (1081212949).

20543045651 is a wasteful number, since it uses less digits than its factorization.

20543045651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081212948.

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 20543045651 in words is "twenty billion, five hundred forty-three million, forty-five thousand, six hundred fifty-one".