20545433245 has 4 divisors (see below), whose sum is σ = 24654519900. Its totient is φ = 16436346592.

The previous prime is 20545433201. The next prime is 20545433263. The reversal of 20545433245 is 54233454502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3164175001 + 17381258244 = 56251^2 + 131838^2 .

It is a cyclic number.

It is not a de Polignac number, because 20545433245 - 2¹³ = 20545425053 is a prime.

It is a super-2 number, since 2×20545433245² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054543320 + ... + 2054543329.

It is an arithmetic number, because the mean of its divisors is an integer number (6163629975).

Almost surely, 2^20545433245 is an apocalyptic number.

It is an amenable number.

20545433245 is a deficient number, since it is larger than the sum of its proper divisors (4109086655).

20545433245 is an equidigital number, since it uses as much as digits as its factorization.

20545433245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4109086654.

The product of its (nonzero) digits is 288000, while the sum is 37.

Adding to 20545433245 its reverse (54233454502), we get a palindrome (74778887747).

The spelling of 20545433245 in words is "twenty billion, five hundred forty-five million, four hundred thirty-three thousand, two hundred forty-five".