20990193 has 32 divisors (see below), whose sum is σ = 34775040. Its totient is φ = 10990080.

The previous prime is 20990183. The next prime is 20990209. The reversal of 20990193 is 39109902.

It is not a de Polignac number, because 20990193 - 2⁸ = 20989937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20990143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11521 + ... + 13217.

It is an arithmetic number, because the mean of its divisors is an integer number (1086720).

Almost surely, 2^20990193 is an apocalyptic number.

It is an amenable number.

20990193 is a deficient number, since it is larger than the sum of its proper divisors (13784847).

20990193 is a wasteful number, since it uses less digits than its factorization.

20990193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 20990193 is about 4581.5055385757. The cubic root of 20990193 is about 275.8494636979.

The spelling of 20990193 in words is "twenty million, nine hundred ninety thousand, one hundred ninety-three".