20002555 has 4 divisors (see below), whose sum is σ = 24003072. Its totient is φ = 16002040.

The previous prime is 20002553. The next prime is 20002579. The reversal of 20002555 is 55520002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55520002 = 2 ⋅27760001.

It is not a de Polignac number, because 20002555 - 2¹ = 20002553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20002553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000251 + ... + 2000260.

It is an arithmetic number, because the mean of its divisors is an integer number (6000768).

Almost surely, 2^20002555 is an apocalyptic number.

20002555 is a deficient number, since it is larger than the sum of its proper divisors (4000517).

20002555 is an equidigital number, since it uses as much as digits as its factorization.

20002555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4000516.

The product of its (nonzero) digits is 500, while the sum is 19.

The square root of 20002555 is about 4472.4216035611. The cubic root of 20002555 is about 271.4533200623.

Adding to 20002555 its reverse (55520002), we get a palindrome (75522557).

The spelling of 20002555 in words is "twenty million, two thousand, five hundred fifty-five".