20904837 has 8 divisors (see below), whose sum is σ = 28521504. Its totient is φ = 13612368.

The previous prime is 20904827. The next prime is 20904839. The reversal of 20904837 is 73840902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20904837 - 2⁶ = 20904773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20904798 and 20904807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20904839) 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, 80898 + ... + 81155.

It is an arithmetic number, because the mean of its divisors is an integer number (3565188).

Almost surely, 2^20904837 is an apocalyptic number.

It is an amenable number.

20904837 is a deficient number, since it is larger than the sum of its proper divisors (7616667).

20904837 is a wasteful number, since it uses less digits than its factorization.

20904837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162099.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20904837 is about 4572.1807707045. The cubic root of 20904837 is about 275.4750444840.

The spelling of 20904837 in words is "twenty million, nine hundred four thousand, eight hundred thirty-seven".