20499007915 has 16 divisors (see below), whose sum is σ = 26235928512. Its totient is φ = 15321877504.

The previous prime is 20499007901. The next prime is 20499007939. The reversal of 20499007915 is 51970099402.

It is a happy number.

It is not a de Polignac number, because 20499007915 - 2²⁵ = 20465453483 is a prime.

It is a super-3 number, since 3×20499007915³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

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, 868519 + ... + 891808.

It is an arithmetic number, because the mean of its divisors is an integer number (1639745532).

Almost surely, 2^20499007915 is an apocalyptic number.

20499007915 is a deficient number, since it is larger than the sum of its proper divisors (5736920597).

20499007915 is a wasteful number, since it uses less digits than its factorization.

20499007915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760486.

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 20499007915 in words is "twenty billion, four hundred ninety-nine million, seven thousand, nine hundred fifteen".