20604151 has 4 divisors (see below), whose sum is σ = 21688600. Its totient is φ = 19519704.

The previous prime is 20604149. The next prime is 20604173. The reversal of 20604151 is 15140602.

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

It is a cyclic number.

It is not a de Polignac number, because 20604151 - 2¹ = 20604149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1084429 = 20604151 / (2 + 0 + 6 + 0 + 4 + 1 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604131) 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, 542196 + ... + 542233.

It is an arithmetic number, because the mean of its divisors is an integer number (5422150).

Almost surely, 2^20604151 is an apocalyptic number.

20604151 is a deficient number, since it is larger than the sum of its proper divisors (1084449).

20604151 is a wasteful number, since it uses less digits than its factorization.

20604151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084448.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20604151 is about 4539.1795514168. The cubic root of 20604151 is about 274.1478902196.

Adding to 20604151 its reverse (15140602), we get a palindrome (35744753).

The spelling of 20604151 in words is "twenty million, six hundred four thousand, one hundred fifty-one".