20420404433 has 48 divisors (see below), whose sum is σ = 26094216960. Its totient is φ = 15824941440.

The previous prime is 20420404423. The next prime is 20420404441. The reversal of 20420404433 is 33440402402.

It is not a de Polignac number, because 20420404433 - 2⁸ = 20420404177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20420404423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1039460 + ... + 1058922.

It is an arithmetic number, because the mean of its divisors is an integer number (543629520).

Almost surely, 2^20420404433 is an apocalyptic number.

20420404433 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20420404433 is a deficient number, since it is larger than the sum of its proper divisors (5673812527).

20420404433 is a wasteful number, since it uses less digits than its factorization.

20420404433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19550 (or 19539 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 26.

Adding to 20420404433 its reverse (33440402402), we get a palindrome (53860806835).

The spelling of 20420404433 in words is "twenty billion, four hundred twenty million, four hundred four thousand, four hundred thirty-three".