20333404431 has 16 divisors (see below), whose sum is σ = 30289997920. Its totient is φ = 13480706880.

The previous prime is 20333404381. The next prime is 20333404457. The reversal of 20333404431 is 13440433302.

It is not a de Polignac number, because 20333404431 - 2¹⁰ = 20333403407 is a prime.

It is a super-2 number, since 2×20333404431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20333404395 and 20333404404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20333405431) 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, 2075470 + ... + 2085243.

It is an arithmetic number, because the mean of its divisors is an integer number (1893124870).

Almost surely, 2^20333404431 is an apocalyptic number.

20333404431 is a deficient number, since it is larger than the sum of its proper divisors (9956593489).

20333404431 is a wasteful number, since it uses less digits than its factorization.

20333404431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4160903 (or 4160897 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 20333404431 its reverse (13440433302), we get a palindrome (33773837733).

The spelling of 20333404431 in words is "twenty billion, three hundred thirty-three million, four hundred four thousand, four hundred thirty-one".