20133553 has 6 divisors (see below), whose sum is σ = 22130402. Its totient is φ = 18303120.

The previous prime is 20133551. The next prime is 20133557. The reversal of 20133553 is 35533102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13337104 + 6796449 = 3652^2 + 2607^2 .

It is not a de Polignac number, because 20133553 - 2¹ = 20133551 is a prime.

It is a super-3 number, since 3×20133553³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83076 + ... + 83317.

Almost surely, 2^20133553 is an apocalyptic number.

It is an amenable number.

20133553 is a deficient number, since it is larger than the sum of its proper divisors (1996849).

20133553 is a wasteful number, since it uses less digits than its factorization.

20133553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166415 (or 166404 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 22.

The square root of 20133553 is about 4487.0427900790. The cubic root of 20133553 is about 272.0446194463.

Adding to 20133553 its reverse (35533102), we get a palindrome (55666655).

The spelling of 20133553 in words is "twenty million, one hundred thirty-three thousand, five hundred fifty-three".