20434559931 has 16 divisors (see below), whose sum is σ = 30288616320. Its totient is φ = 13616202600.

The previous prime is 20434559927. The next prime is 20434559993. The reversal of 20434559931 is 13995543402.

20434559931 is a `hidden beast` number, since 2 + 0 + 4 + 3 + 4 + 559 + 93 + 1 = 666.

It is not a de Polignac number, because 20434559931 - 2² = 20434559927 is a prime.

It is a super-2 number, since 2×20434559931² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20434555931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134845 + ... + 243006.

It is an arithmetic number, because the mean of its divisors is an integer number (1893038520).

Almost surely, 2^20434559931 is an apocalyptic number.

20434559931 is a deficient number, since it is larger than the sum of its proper divisors (9854056389).

20434559931 is a wasteful number, since it uses less digits than its factorization.

20434559931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379863 (or 379857 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 20434559931 in words is "twenty billion, four hundred thirty-four million, five hundred fifty-nine thousand, nine hundred thirty-one".