20628133 has 4 divisors (see below), whose sum is σ = 20638528. Its totient is φ = 20617740.

The previous prime is 20628103. The next prime is 20628137. The reversal of 20628133 is 33182602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 33182602 = 2 ⋅16591301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20628133 is a prime.

It is a super-3 number, since 3×20628133³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20628098 and 20628107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191 + ... + 6532.

It is an arithmetic number, because the mean of its divisors is an integer number (5159632).

Almost surely, 2^20628133 is an apocalyptic number.

It is an amenable number.

20628133 is a deficient number, since it is larger than the sum of its proper divisors (10395).

20628133 is an equidigital number, since it uses as much as digits as its factorization.

20628133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10394.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20628133 is about 4541.8204499958. The cubic root of 20628133 is about 274.2542128975.

The spelling of 20628133 in words is "twenty million, six hundred twenty-eight thousand, one hundred thirty-three".