20603313 has 12 divisors (see below), whose sum is σ = 30720768. Its totient is φ = 13292280.

The previous prime is 20603309. The next prime is 20603327. The reversal of 20603313 is 31330602.

It is a happy number.

It is not a de Polignac number, because 20603313 - 2² = 20603309 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20602313) 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, 36645 + ... + 37202.

It is an arithmetic number, because the mean of its divisors is an integer number (2560064).

Almost surely, 2^20603313 is an apocalyptic number.

It is an amenable number.

20603313 is a deficient number, since it is larger than the sum of its proper divisors (10117455).

20603313 is a wasteful number, since it uses less digits than its factorization.

20603313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73884 (or 73881 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 20603313 is about 4539.0872430479. The cubic root of 20603313 is about 274.1441735082.

Adding to 20603313 its reverse (31330602), we get a palindrome (51933915).

The spelling of 20603313 in words is "twenty million, six hundred three thousand, three hundred thirteen".