20196145 has 24 divisors (see below), whose sum is σ = 26115264. Its totient is φ = 14987808.

The previous prime is 20196109. The next prime is 20196173. The reversal of 20196145 is 54169102.

20196145 = T₁₆₆ + T₁₆₇ + ... + T₅₀₀.

It is a de Polignac number, because none of the positive numbers 2^k-20196145 is a prime.

It is a super-2 number, since 2×20196145² = 815768545722050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 120852 + ... + 121018.

It is an arithmetic number, because the mean of its divisors is an integer number (1088136).

Almost surely, 2^20196145 is an apocalyptic number.

It is an amenable number.

20196145 is a deficient number, since it is larger than the sum of its proper divisors (5919119).

20196145 is a wasteful number, since it uses less digits than its factorization.

20196145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20196145 is about 4494.0121272645. The cubic root of 20196145 is about 272.3262422287.

The spelling of 20196145 in words is "twenty million, one hundred ninety-six thousand, one hundred forty-five".