20531454351 has 4 divisors (see below), whose sum is σ = 27375272472. Its totient is φ = 13687636232.

The previous prime is 20531454341. The next prime is 20531454379. The reversal of 20531454351 is 15345413502.

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 20531454351 - 2¹⁷ = 20531323279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531454331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3421909056 + ... + 3421909061.

It is an arithmetic number, because the mean of its divisors is an integer number (6843818118).

Almost surely, 2^20531454351 is an apocalyptic number.

20531454351 is a deficient number, since it is larger than the sum of its proper divisors (6843818121).

20531454351 is an equidigital number, since it uses as much as digits as its factorization.

20531454351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6843818120.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 20531454351 its reverse (15345413502), we get a palindrome (35876867853).

The spelling of 20531454351 in words is "twenty billion, five hundred thirty-one million, four hundred fifty-four thousand, three hundred fifty-one".