20819133 has 8 divisors (see below), whose sum is σ = 30843200. Its totient is φ = 13879404.

The previous prime is 20819119. The next prime is 20819143. The reversal of 20819133 is 33191802.

It is not a de Polignac number, because 20819133 - 2⁹ = 20818621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 771079 = 20819133 / (2 + 0 + 8 + 1 + 9 + 1 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20819097 and 20819106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20819143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385513 + ... + 385566.

It is an arithmetic number, because the mean of its divisors is an integer number (3855400).

Almost surely, 2^20819133 is an apocalyptic number.

It is an amenable number.

20819133 is a deficient number, since it is larger than the sum of its proper divisors (10024067).

20819133 is an equidigital number, since it uses as much as digits as its factorization.

20819133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771088 (or 771082 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20819133 is about 4562.7988121327. The cubic root of 20819133 is about 275.0980719080.

The spelling of 20819133 in words is "twenty million, eight hundred nineteen thousand, one hundred thirty-three".