20990098 has 16 divisors (see below), whose sum is σ = 33304320. Its totient is φ = 9894096.

The previous prime is 20990071. The next prime is 20990111. The reversal of 20990098 is 89009902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7236 + ... + 9712.

It is an arithmetic number, because the mean of its divisors is an integer number (2081520).

Almost surely, 2^20990098 is an apocalyptic number.

20990098 is a deficient number, since it is larger than the sum of its proper divisors (12314222).

20990098 is a wasteful number, since it uses less digits than its factorization.

20990098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721.

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

The square root of 20990098 is about 4581.4951707930. The cubic root of 20990098 is about 275.8490475395.

The spelling of 20990098 in words is "twenty million, nine hundred ninety thousand, ninety-eight".