20205140451 has 4 divisors (see below), whose sum is σ = 26940187272. Its totient is φ = 13470093632.

The previous prime is 20205140447. The next prime is 20205140513. The reversal of 20205140451 is 15404150202.

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 20205140451 - 2² = 20205140447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20205140411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3367523406 + ... + 3367523411.

It is an arithmetic number, because the mean of its divisors is an integer number (6735046818).

Almost surely, 2^20205140451 is an apocalyptic number.

20205140451 is a deficient number, since it is larger than the sum of its proper divisors (6735046821).

20205140451 is an equidigital number, since it uses as much as digits as its factorization.

20205140451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735046820.

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 20205140451 its reverse (15404150202), we get a palindrome (35609290653).

The spelling of 20205140451 in words is "twenty billion, two hundred five million, one hundred forty thousand, four hundred fifty-one".