20603421 has 12 divisors (see below), whose sum is σ = 30249180. Its totient is φ = 13510080.

The previous prime is 20603417. The next prime is 20603431. The reversal of 20603421 is 12430602.

It is a happy number.

20603421 is a `hidden beast` number, since 20 + 603 + 42 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 622521 + 19980900 = 789^2 + 4470^2 .

It is not a de Polignac number, because 20603421 - 2² = 20603417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20603394 and 20603403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20603431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18216 + ... + 19313.

It is an arithmetic number, because the mean of its divisors is an integer number (2520765).

Almost surely, 2^20603421 is an apocalyptic number.

It is an amenable number.

20603421 is a deficient number, since it is larger than the sum of its proper divisors (9645759).

20603421 is a wasteful number, since it uses less digits than its factorization.

20603421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37596 (or 37593 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20603421 is about 4539.0991396972. The cubic root of 20603421 is about 274.1446525173.

The spelling of 20603421 in words is "twenty million, six hundred three thousand, four hundred twenty-one".