20016455 has 4 divisors (see below), whose sum is σ = 24019752. Its totient is φ = 16013160.

The previous prime is 20016439. The next prime is 20016461. The reversal of 20016455 is 55461002.

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

It is not a de Polignac number, because 20016455 - 2⁴ = 20016439 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 20016455.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2001641 + ... + 2001650.

It is an arithmetic number, because the mean of its divisors is an integer number (6004938).

Almost surely, 2^20016455 is an apocalyptic number.

20016455 is a deficient number, since it is larger than the sum of its proper divisors (4003297).

20016455 is an equidigital number, since it uses as much as digits as its factorization.

20016455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003296.

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

The square root of 20016455 is about 4473.9753016752. The cubic root of 20016455 is about 271.5161841560.

Adding to 20016455 its reverse (55461002), we get a palindrome (75477457).

The spelling of 20016455 in words is "twenty million, sixteen thousand, four hundred fifty-five".