20434823081 has 16 divisors (see below), whose sum is σ = 20754274560. Its totient is φ = 20118067200.

The previous prime is 20434823051. The next prime is 20434823083. The reversal of 20434823081 is 18032843402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20434823081 is a prime.

It is a super-2 number, since 2×20434823081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20434823083) 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, 17722601 + ... + 17723753.

It is an arithmetic number, because the mean of its divisors is an integer number (1297142160).

Almost surely, 2^20434823081 is an apocalyptic number.

It is an amenable number.

20434823081 is a deficient number, since it is larger than the sum of its proper divisors (319451479).

20434823081 is a wasteful number, since it uses less digits than its factorization.

20434823081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096.

The product of its (nonzero) digits is 36864, while the sum is 35.

The spelling of 20434823081 in words is "twenty billion, four hundred thirty-four million, eight hundred twenty-three thousand, eighty-one".