20907133 has 4 divisors (see below), whose sum is σ = 22515388. Its totient is φ = 19298880.

The previous prime is 20907091. The next prime is 20907137. The reversal of 20907133 is 33170902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2010724 + 18896409 = 1418^2 + 4347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20907133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20907098 and 20907107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20907137) 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, 804108 + ... + 804133.

It is an arithmetic number, because the mean of its divisors is an integer number (5628847).

Almost surely, 2^20907133 is an apocalyptic number.

It is an amenable number.

20907133 is a deficient number, since it is larger than the sum of its proper divisors (1608255).

20907133 is a wasteful number, since it uses less digits than its factorization.

20907133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608254.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 20907133 is about 4572.4318474965. The cubic root of 20907133 is about 275.4851293517.

The spelling of 20907133 in words is "twenty million, nine hundred seven thousand, one hundred thirty-three".