20142455 has 4 divisors (see below), whose sum is σ = 24170952. Its totient is φ = 16113960.

The previous prime is 20142427. The next prime is 20142481. The reversal of 20142455 is 55424102.

It is a happy number.

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

It is not a de Polignac number, because 20142455 - 2¹⁶ = 20076919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20142455.

It is a congruent 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, 2014241 + ... + 2014250.

It is an arithmetic number, because the mean of its divisors is an integer number (6042738).

Almost surely, 2^20142455 is an apocalyptic number.

20142455 is a deficient number, since it is larger than the sum of its proper divisors (4028497).

20142455 is an equidigital number, since it uses as much as digits as its factorization.

20142455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028496.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 20142455 is about 4488.0346478163. The cubic root of 20142455 is about 272.0847081540.

Adding to 20142455 its reverse (55424102), we get a palindrome (75566557).

The spelling of 20142455 in words is "twenty million, one hundred forty-two thousand, four hundred fifty-five".