20692145 has 8 divisors (see below), whose sum is σ = 26291304. Its totient is φ = 15579904.

The previous prime is 20692141. The next prime is 20692153. The reversal of 20692145 is 54129602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3444736 + 17247409 = 1856^2 + 4153^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20692145 - 2² = 20692141 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20692141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121634 + ... + 121803.

It is an arithmetic number, because the mean of its divisors is an integer number (3286413).

Almost surely, 2^20692145 is an apocalyptic number.

It is an amenable number.

20692145 is a deficient number, since it is larger than the sum of its proper divisors (5599159).

20692145 is a wasteful number, since it uses less digits than its factorization.

20692145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243459.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20692145 is about 4548.8619455860. The cubic root of 20692145 is about 274.5376031069.

The spelling of 20692145 in words is "twenty million, six hundred ninety-two thousand, one hundred forty-five".