20430740565 has 80 divisors (see below), whose sum is σ = 38705325120. Its totient is φ = 10281738240.

The previous prime is 20430740531. The next prime is 20430740567. The reversal of 20430740565 is 56504703402.

20430740565 is a `hidden beast` number, since 20 + 4 + 3 + 0 + 74 + 0 + 565 = 666.

It is not a de Polignac number, because 20430740565 - 2⁶ = 20430740501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430740567) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1972450 + ... + 1982780.

It is an arithmetic number, because the mean of its divisors is an integer number (483816564).

Almost surely, 2^20430740565 is an apocalyptic number.

It is an amenable number.

20430740565 is a deficient number, since it is larger than the sum of its proper divisors (18274584555).

20430740565 is a wasteful number, since it uses less digits than its factorization.

20430740565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10624 (or 10615 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 36.

The spelling of 20430740565 in words is "twenty billion, four hundred thirty million, seven hundred forty thousand, five hundred sixty-five".