20456909527 has 4 divisors (see below), whose sum is σ = 21346340400. Its totient is φ = 19567478656.

The previous prime is 20456909513. The next prime is 20456909549. The reversal of 20456909527 is 72590965402.

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 20456909527 - 2⁷ = 20456909399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456909027) 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, 444715402 + ... + 444715447.

It is an arithmetic number, because the mean of its divisors is an integer number (5336585100).

Almost surely, 2^20456909527 is an apocalyptic number.

20456909527 is a deficient number, since it is larger than the sum of its proper divisors (889430873).

20456909527 is an equidigital number, since it uses as much as digits as its factorization.

20456909527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889430872.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 20456909527 in words is "twenty billion, four hundred fifty-six million, nine hundred nine thousand, five hundred twenty-seven".