99920124 has 18 divisors (see below), whose sum is σ = 252575960. Its totient is φ = 33306696.

The previous prime is 99920123. The next prime is 99920147. The reversal of 99920124 is 42102999.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2775559 = 99920124 / (9 + 9 + 9 + 2 + 0 + 1 + 2 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99920123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1387744 + ... + 1387815.

Almost surely, 2^99920124 is an apocalyptic number.

It is an amenable number.

99920124 is an abundant number, since it is smaller than the sum of its proper divisors (152655836).

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

99920124 is a wasteful number, since it uses less digits than its factorization.

99920124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775569 (or 2775564 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 99920124 is about 9996.0054021594. The cubic root of 99920124 is about 464.0352665922.

The spelling of 99920124 in words is "ninety-nine million, nine hundred twenty thousand, one hundred twenty-four".