20505003497 has 8 divisors (see below), whose sum is σ = 22408414560. Its totient is φ = 18608145760.

The previous prime is 20505003469. The next prime is 20505003503. The reversal of 20505003497 is 79430050502.

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

It is a cyclic number.

It is not a de Polignac number, because 20505003497 - 2²² = 20500809193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20505003097) 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, 1631783 + ... + 1644300.

It is an arithmetic number, because the mean of its divisors is an integer number (2801051820).

Almost surely, 2^20505003497 is an apocalyptic number.

It is an amenable number.

20505003497 is a deficient number, since it is larger than the sum of its proper divisors (1903411063).

20505003497 is a wasteful number, since it uses less digits than its factorization.

20505003497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276663.

The product of its (nonzero) digits is 37800, while the sum is 35.

Adding to 20505003497 its reverse (79430050502), we get a palindrome (99935053999).

The spelling of 20505003497 in words is "twenty billion, five hundred five million, three thousand, four hundred ninety-seven".