20452826521 has 4 divisors (see below), whose sum is σ = 21342079872. Its totient is φ = 19563573172.

The previous prime is 20452826503. The next prime is 20452826539. The reversal of 20452826521 is 12562825402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20452826503) and next prime (20452826539).

It is a cyclic number.

It is not a de Polignac number, because 20452826521 - 2²³ = 20444437913 is a prime.

It is a super-2 number, since 2×20452826521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20452826561) 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, 444626641 + ... + 444626686.

It is an arithmetic number, because the mean of its divisors is an integer number (5335519968).

Almost surely, 2^20452826521 is an apocalyptic number.

It is an amenable number.

20452826521 is a deficient number, since it is larger than the sum of its proper divisors (889253351).

20452826521 is an equidigital number, since it uses as much as digits as its factorization.

20452826521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889253350.

The product of its (nonzero) digits is 76800, while the sum is 37.

The spelling of 20452826521 in words is "twenty billion, four hundred fifty-two million, eight hundred twenty-six thousand, five hundred twenty-one".