20142865 has 4 divisors (see below), whose sum is σ = 24171444. Its totient is φ = 16114288.

The previous prime is 20142851. The next prime is 20142887. The reversal of 20142865 is 56824102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56824102 = 2 ⋅28412051.

It can be written as a sum of positive squares in 2 ways, for example, as 6185169 + 13957696 = 2487^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 20142865 - 2⁵ = 20142833 is a prime.

It is a Duffinian number.

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, 2014282 + ... + 2014291.

It is an arithmetic number, because the mean of its divisors is an integer number (6042861).

Almost surely, 2^20142865 is an apocalyptic number.

It is an amenable number.

20142865 is a deficient number, since it is larger than the sum of its proper divisors (4028579).

20142865 is an equidigital number, since it uses as much as digits as its factorization.

20142865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028578.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20142865 is about 4488.0803245931. The cubic root of 20142865 is about 272.0865542377.

Adding to 20142865 its reverse (56824102), we get a palindrome (76966967).

The spelling of 20142865 in words is "twenty million, one hundred forty-two thousand, eight hundred sixty-five".