99201920 has 32 divisors (see below), whose sum is σ = 237156120. Its totient is φ = 39680512.

The previous prime is 99201901. The next prime is 99201923. The reversal of 99201920 is 2910299.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99201923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76862 + ... + 78141.

Almost surely, 2^99201920 is an apocalyptic number.

It is an amenable number.

99201920 is an abundant number, since it is smaller than the sum of its proper divisors (137954200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99201920 is a wasteful number, since it uses less digits than its factorization.

99201920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155022 (or 155010 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 99201920 is about 9960.0160642441. The cubic root of 99201920 is about 462.9207974524.

The spelling of 99201920 in words is "ninety-nine million, two hundred one thousand, nine hundred twenty".