20009998 has 8 divisors (see below), whose sum is σ = 30035880. Its totient is φ = 9998040.

The previous prime is 20009987. The next prime is 20009999. The reversal of 20009998 is 89990002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20009999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1593 + ... + 6523.

It is an arithmetic number, because the mean of its divisors is an integer number (3754485).

Almost surely, 2^20009998 is an apocalyptic number.

20009998 is a deficient number, since it is larger than the sum of its proper divisors (10025882).

20009998 is a wasteful number, since it uses less digits than its factorization.

20009998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6962.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 20009998 is about 4473.2536257181. The cubic root of 20009998 is about 271.4869853701.

The spelling of 20009998 in words is "twenty million, nine thousand, nine hundred ninety-eight".