20154065 has 4 divisors (see below), whose sum is σ = 24184884. Its totient is φ = 16123248.

The previous prime is 20154037. The next prime is 20154089. The reversal of 20154065 is 56045102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14432401 + 5721664 = 3799^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 20154065 - 2¹⁴ = 20137681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20154065.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015402 + ... + 2015411.

It is an arithmetic number, because the mean of its divisors is an integer number (6046221).

Almost surely, 2^20154065 is an apocalyptic number.

It is an amenable number.

20154065 is a deficient number, since it is larger than the sum of its proper divisors (4030819).

20154065 is an equidigital number, since it uses as much as digits as its factorization.

20154065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030818.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20154065 is about 4489.3279006996. The cubic root of 20154065 is about 272.1369741552.

Adding to 20154065 its reverse (56045102), we get a palindrome (76199167).

The spelling of 20154065 in words is "twenty million, one hundred fifty-four thousand, sixty-five".