20430655531 has 8 divisors (see below), whose sum is σ = 24002448624. Its totient is φ = 17144605920.

The previous prime is 20430655517. The next prime is 20430655541. The reversal of 20430655531 is 13555603402.

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

It is not a de Polignac number, because 20430655531 - 2⁵ = 20430655499 is a prime.

It is a super-2 number, since 2×20430655531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20430655541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71435716 + ... + 71436001.

It is an arithmetic number, because the mean of its divisors is an integer number (3000306078).

Almost surely, 2^20430655531 is an apocalyptic number.

20430655531 is a deficient number, since it is larger than the sum of its proper divisors (3571793093).

20430655531 is a wasteful number, since it uses less digits than its factorization.

20430655531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142871741.

The product of its (nonzero) digits is 54000, while the sum is 34.

The spelling of 20430655531 in words is "twenty billion, four hundred thirty million, six hundred fifty-five thousand, five hundred thirty-one".