20188145 has 16 divisors (see below), whose sum is σ = 24910848. Its totient is φ = 15698880.

The previous prime is 20188141. The next prime is 20188151. The reversal of 20188145 is 54188102.

It is not a de Polignac number, because 20188145 - 2² = 20188141 is a prime.

It is a super-2 number, since 2×20188145² = 815122397082050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20188141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63527 + ... + 63843.

It is an arithmetic number, because the mean of its divisors is an integer number (1556928).

Almost surely, 2^20188145 is an apocalyptic number.

It is an amenable number.

20188145 is a deficient number, since it is larger than the sum of its proper divisors (4722703).

20188145 is a wasteful number, since it uses less digits than its factorization.

20188145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 20188145 is about 4493.1219658496. The cubic root of 20188145 is about 272.2902799586.

The spelling of 20188145 in words is "twenty million, one hundred eighty-eight thousand, one hundred forty-five".