20551433 has 6 divisors (see below), whose sum is σ = 23906826. Its totient is φ = 17615472.

The previous prime is 20551417. The next prime is 20551441. The reversal of 20551433 is 33415502.

It can be written as a sum of positive squares in only one way, i.e., 14341369 + 6210064 = 3787^2 + 2492^2 .

It is not a de Polignac number, because 20551433 - 2⁴ = 20551417 is a prime.

It is a super-2 number, since 2×20551433² = 844722796706978, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20551399 and 20551408.

It is not an unprimeable number, because it can be changed into a prime (20551403) 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, 209660 + ... + 209757.

It is an arithmetic number, because the mean of its divisors is an integer number (3984471).

Almost surely, 2^20551433 is an apocalyptic number.

It is an amenable number.

20551433 is a deficient number, since it is larger than the sum of its proper divisors (3355393).

20551433 is an equidigital number, since it uses as much as digits as its factorization.

20551433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419431 (or 419424 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20551433 is about 4533.3688356453. The cubic root of 20551433 is about 273.9138779542.

Adding to 20551433 its reverse (33415502), we get a palindrome (53966935).

The spelling of 20551433 in words is "twenty million, five hundred fifty-one thousand, four hundred thirty-three".