99920013 has 12 divisors (see below), whose sum is σ = 135461664. Its totient is φ = 65514000.

The previous prime is 99919997. The next prime is 99920021. The reversal of 99920013 is 31002999.

It is not a de Polignac number, because 99920013 - 2⁴ = 99919997 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99920053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6688 + ... + 15638.

It is an arithmetic number, because the mean of its divisors is an integer number (11288472).

Almost surely, 2^99920013 is an apocalyptic number.

It is an amenable number.

99920013 is a deficient number, since it is larger than the sum of its proper divisors (35541651).

99920013 is an equidigital number, since it uses as much as digits as its factorization.

99920013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9076 (or 9015 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 99920013 is about 9995.9998499400. Note that the first 3 decimals coincide. The cubic root of 99920013 is about 464.0350947618.

It can be divided in two parts, 999 and 20013, that added together give a palindrome (21012).

The spelling of 99920013 in words is "ninety-nine million, nine hundred twenty thousand, thirteen".