20445410521 has 4 divisors (see below), whose sum is σ = 20636489232. Its totient is φ = 20254331812.

The previous prime is 20445410497. The next prime is 20445410537. The reversal of 20445410521 is 12501454402.

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 a cyclic number.

It is not a de Polignac number, because 20445410521 - 2¹⁵ = 20445377753 is a prime.

It is a super-2 number, since 2×20445410521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20445410521.

It is not an unprimeable number, because it can be changed into a prime (20445410551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95539195 + ... + 95539408.

It is an arithmetic number, because the mean of its divisors is an integer number (5159122308).

Almost surely, 2^20445410521 is an apocalyptic number.

It is an amenable number.

20445410521 is a deficient number, since it is larger than the sum of its proper divisors (191078711).

20445410521 is a wasteful number, since it uses less digits than its factorization.

20445410521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191078710.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 20445410521 its reverse (12501454402), we get a palindrome (32946864923).

The spelling of 20445410521 in words is "twenty billion, four hundred forty-five million, four hundred ten thousand, five hundred twenty-one".