20904601 has 4 divisors (see below), whose sum is σ = 21199104. Its totient is φ = 20610100.

The previous prime is 20904599. The next prime is 20904619. The reversal of 20904601 is 10640902.

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 an emirpimes, since its reverse is a distinct semiprime: 10640902 = 2 ⋅5320451.

It is a cyclic number.

It is not a de Polignac number, because 20904601 - 2¹ = 20904599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20904641) 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, 147145 + ... + 147286.

It is an arithmetic number, because the mean of its divisors is an integer number (5299776).

Almost surely, 2^20904601 is an apocalyptic number.

It is an amenable number.

20904601 is a deficient number, since it is larger than the sum of its proper divisors (294503).

20904601 is an equidigital number, since it uses as much as digits as its factorization.

20904601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294502.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20904601 is about 4572.1549623782. The cubic root of 20904601 is about 275.4740078442.

The spelling of 20904601 in words is "twenty million, nine hundred four thousand, six hundred one".