20603689 has 8 divisors (see below), whose sum is σ = 21242592. Its totient is φ = 19971360.

The previous prime is 20603669. The next prime is 20603701. The reversal of 20603689 is 98630602.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20603689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20603669) 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, 5142 + ... + 8224.

It is an arithmetic number, because the mean of its divisors is an integer number (2655324).

Almost surely, 2^20603689 is an apocalyptic number.

It is an amenable number.

20603689 is a deficient number, since it is larger than the sum of its proper divisors (638903).

20603689 is a wasteful number, since it uses less digits than its factorization.

20603689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20603689 is about 4539.1286608775. The cubic root of 20603689 is about 274.1458411621.

The spelling of 20603689 in words is "twenty million, six hundred three thousand, six hundred eighty-nine".