20196251 has 4 divisors (see below), whose sum is σ = 20271600. Its totient is φ = 20120904.

The previous prime is 20196227. The next prime is 20196299. The reversal of 20196251 is 15269102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20196251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20196251.

It is not an unprimeable number, because it can be changed into a prime (20196751) 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 3 ways as a sum of consecutive naturals, for example, 37271 + ... + 37808.

It is an arithmetic number, because the mean of its divisors is an integer number (5067900).

Almost surely, 2^20196251 is an apocalyptic number.

20196251 is a deficient number, since it is larger than the sum of its proper divisors (75349).

20196251 is an equidigital number, since it uses as much as digits as its factorization.

20196251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75348.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 20196251 is about 4494.0239207196. The cubic root of 20196251 is about 272.3267186650.

The spelling of 20196251 in words is "twenty million, one hundred ninety-six thousand, two hundred fifty-one".