20645003015 has 16 divisors (see below), whose sum is σ = 30491082048. Its totient is φ = 13067606016.

The previous prime is 20645003003. The next prime is 20645003017. The reversal of 20645003015 is 51030054602.

It is a cyclic number.

It is not a de Polignac number, because 20645003015 - 2⁶ = 20645002951 is a prime.

It is a super-2 number, since 2×20645003015² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645003017) 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 15 ways as a sum of consecutive naturals, for example, 22686362 + ... + 22687271.

It is an arithmetic number, because the mean of its divisors is an integer number (1905692628).

Almost surely, 2^20645003015 is an apocalyptic number.

20645003015 is a deficient number, since it is larger than the sum of its proper divisors (9846079033).

20645003015 is a wasteful number, since it uses less digits than its factorization.

20645003015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45373658.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20645003015 its reverse (51030054602), we get a palindrome (71675057617).

The spelling of 20645003015 in words is "twenty billion, six hundred forty-five million, three thousand, fifteen".