99920015 has 16 divisors (see below), whose sum is σ = 129360000. Its totient is φ = 73654272.

The previous prime is 99919997. The next prime is 99920021. The reversal of 99920015 is 51002999.

It is a Cunningham number, because it is equal to 9996²-1.

It is a cyclic number.

It is not a de Polignac number, because 99920015 - 2⁶ = 99919951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48986 + ... + 50984.

It is an arithmetic number, because the mean of its divisors is an integer number (8085000).

Almost surely, 2^99920015 is an apocalyptic number.

99920015 is a deficient number, since it is larger than the sum of its proper divisors (29439985).

99920015 is a wasteful number, since it uses less digits than its factorization.

99920015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 99920015 is about 9995.9999499800. Note that the first 4 decimals coincide. The cubic root of 99920015 is about 464.0350978578.

The spelling of 99920015 in words is "ninety-nine million, nine hundred twenty thousand, fifteen".