20430561954 has 48 divisors (see below), whose sum is σ = 47352161376. Its totient is φ = 5826892800.

The previous prime is 20430561947. The next prime is 20430561979. The reversal of 20430561954 is 45916503402.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 516487 + ... + 554634.

It is an arithmetic number, because the mean of its divisors is an integer number (986503362).

Almost surely, 2^20430561954 is an apocalyptic number.

20430561954 is an abundant number, since it is smaller than the sum of its proper divisors (26921599422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20430561954 is a wasteful number, since it uses less digits than its factorization.

20430561954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071171 (or 1071154 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 20430561954 in words is "twenty billion, four hundred thirty million, five hundred sixty-one thousand, nine hundred fifty-four".