20245205515 has 16 divisors (see below), whose sum is σ = 25543990080. Its totient is φ = 15381313920.

The previous prime is 20245205507. The next prime is 20245205581. The reversal of 20245205515 is 51550254202.

It is a happy number.

It is not a de Polignac number, because 20245205515 - 2³ = 20245205507 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1135599 + ... + 1153288.

It is an arithmetic number, because the mean of its divisors is an integer number (1596499380).

Almost surely, 2^20245205515 is an apocalyptic number.

20245205515 is a deficient number, since it is larger than the sum of its proper divisors (5298784565).

20245205515 is a wasteful number, since it uses less digits than its factorization.

20245205515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288982.

The product of its (nonzero) digits is 20000, while the sum is 31.

Adding to 20245205515 its reverse (51550254202), we get a palindrome (71795459717).

The spelling of 20245205515 in words is "twenty billion, two hundred forty-five million, two hundred five thousand, five hundred fifteen".