20198904 has 32 divisors (see below), whose sum is σ = 55088640. Its totient is φ = 6120800.

The previous prime is 20198903. The next prime is 20198911. The reversal of 20198904 is 40989102.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20198903) 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 7 ways as a sum of consecutive naturals, for example, 37992 + ... + 38519.

It is an arithmetic number, because the mean of its divisors is an integer number (1721520).

Almost surely, 2^20198904 is an apocalyptic number.

20198904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20198904 is an abundant number, since it is smaller than the sum of its proper divisors (34889736).

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

20198904 is a wasteful number, since it uses less digits than its factorization.

20198904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76531 (or 76527 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20198904 is about 4494.3190807952. The cubic root of 20198904 is about 272.3386425142.

The spelling of 20198904 in words is "twenty million, one hundred ninety-eight thousand, nine hundred four".