20423133 has 6 divisors (see below), whose sum is σ = 29500094. Its totient is φ = 13615416.

The previous prime is 20423129. The next prime is 20423147. The reversal of 20423133 is 33132402.

It can be written as a sum of positive squares in only one way, i.e., 19686969 + 736164 = 4437^2 + 858^2 .

It is not a de Polignac number, because 20423133 - 2² = 20423129 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1134610 + ... + 1134627.

Almost surely, 2^20423133 is an apocalyptic number.

It is an amenable number.

20423133 is a deficient number, since it is larger than the sum of its proper divisors (9076961).

20423133 is a wasteful number, since it uses less digits than its factorization.

20423133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269243 (or 2269240 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 20423133 is about 4519.1960568225. The cubic root of 20423133 is about 273.3426844246.

Adding to 20423133 its reverse (33132402), we get a palindrome (53555535).

The spelling of 20423133 in words is "twenty million, four hundred twenty-three thousand, one hundred thirty-three".