20194521 has 8 divisors (see below), whose sum is σ = 28509984. Its totient is φ = 12671040.

The previous prime is 20194519. The next prime is 20194523. The reversal of 20194521 is 12549102.

It is an interprime number because it is at equal distance from previous prime (20194519) and next prime (20194523).

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

It is not a de Polignac number, because 20194521 - 2¹ = 20194519 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20194491 and 20194500.

It is not an unprimeable number, because it can be changed into a prime (20194523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197935 + ... + 198036.

It is an arithmetic number, because the mean of its divisors is an integer number (3563748).

Almost surely, 2^20194521 is an apocalyptic number.

It is an amenable number.

20194521 is a deficient number, since it is larger than the sum of its proper divisors (8315463).

20194521 is a wasteful number, since it uses less digits than its factorization.

20194521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395991.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 20194521 is about 4493.8314387614. The cubic root of 20194521 is about 272.3189426562.

The spelling of 20194521 in words is "twenty million, one hundred ninety-four thousand, five hundred twenty-one".