20501045245 has 8 divisors (see below), whose sum is σ = 24661406520. Its totient is φ = 16360734720.

The previous prime is 20501045207. The next prime is 20501045251. The reversal of 20501045245 is 54254010502.

It can be written as a sum of positive squares in 4 ways, for example, as 6602050009 + 13898995236 = 81253^2 + 117894^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20501045245 is a prime.

It is a super-2 number, since 2×20501045245² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5010436 + ... + 5014525.

It is an arithmetic number, because the mean of its divisors is an integer number (3082675815).

Almost surely, 2^20501045245 is an apocalyptic number.

It is an amenable number.

20501045245 is a deficient number, since it is larger than the sum of its proper divisors (4160361275).

20501045245 is a wasteful number, since it uses less digits than its factorization.

20501045245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10025375.

The product of its (nonzero) digits is 8000, while the sum is 28.

Adding to 20501045245 its reverse (54254010502), we get a palindrome (74755055747).

The spelling of 20501045245 in words is "twenty billion, five hundred one million, forty-five thousand, two hundred forty-five".