20500435451 has 8 divisors (see below), whose sum is σ = 21066338160. Its totient is φ = 19935155808.

The previous prime is 20500435447. The next prime is 20500435477. The reversal of 20500435451 is 15453400502.

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 20500435451 - 2² = 20500435447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20500435481) 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, 88661 + ... + 221046.

It is an arithmetic number, because the mean of its divisors is an integer number (2633292270).

Almost surely, 2^20500435451 is an apocalyptic number.

20500435451 is a deficient number, since it is larger than the sum of its proper divisors (565902709).

20500435451 is a wasteful number, since it uses less digits than its factorization.

20500435451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311533.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 20500435451 its reverse (15453400502), we get a palindrome (35953835953).

The spelling of 20500435451 in words is "twenty billion, five hundred million, four hundred thirty-five thousand, four hundred fifty-one".