19998924 has 24 divisors (see below), whose sum is σ = 50906688. Its totient is φ = 6060240.

The previous prime is 19998917. The next prime is 19998943. The reversal of 19998924 is 42989991.

It is a happy number.

It is a super-2 number, since 2×19998924² = 799913922315552, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75622 + ... + 75885.

It is an arithmetic number, because the mean of its divisors is an integer number (2121112).

Almost surely, 2^19998924 is an apocalyptic number.

It is an amenable number.

19998924 is an abundant number, since it is smaller than the sum of its proper divisors (30907764).

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

19998924 is a wasteful number, since it uses less digits than its factorization.

19998924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151525 (or 151523 counting only the distinct ones).

The product of its digits is 419904, while the sum is 51.

The square root of 19998924 is about 4472.0156529243. The cubic root of 19998924 is about 271.4368937166.

The spelling of 19998924 in words is "nineteen million, nine hundred ninety-eight thousand, nine hundred twenty-four".