20500435447 has 2 divisors, whose sum is σ = 20500435448. Its totient is φ = 20500435446.

The previous prime is 20500435427. The next prime is 20500435477. The reversal of 20500435447 is 74453400502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20500435447 is a prime.

It is a super-2 number, since 2×20500435447² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20500435427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250217723 + 10250217724.

It is an arithmetic number, because the mean of its divisors is an integer number (10250217724).

Almost surely, 2^20500435447 is an apocalyptic number.

20500435447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20500435447 is an equidigital number, since it uses as much as digits as its factorization.

20500435447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 34.

Adding to 20500435447 its reverse (74453400502), we get a palindrome (94953835949).

The spelling of 20500435447 in words is "twenty billion, five hundred million, four hundred thirty-five thousand, four hundred forty-seven".