20305453603 has 4 divisors (see below), whose sum is σ = 20308454848. Its totient is φ = 20302452360.

The previous prime is 20305453601. The next prime is 20305453621. The reversal of 20305453603 is 30635450302.

It is a happy number.

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 20305453603 - 2¹ = 20305453601 is a prime.

It is a super-2 number, since 2×20305453603² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20305453601) 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, 1490451 + ... + 1504012.

It is an arithmetic number, because the mean of its divisors is an integer number (5077113712).

Almost surely, 2^20305453603 is an apocalyptic number.

20305453603 is a deficient number, since it is larger than the sum of its proper divisors (3001245).

20305453603 is an equidigital number, since it uses as much as digits as its factorization.

20305453603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001244.

The product of its (nonzero) digits is 32400, while the sum is 31.

The spelling of 20305453603 in words is "twenty billion, three hundred five million, four hundred fifty-three thousand, six hundred three".