20280263 has 4 divisors (see below), whose sum is σ = 20315400. Its totient is φ = 20245128.

The previous prime is 20280259. The next prime is 20280287. The reversal of 20280263 is 36208202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36208202 = 2 ⋅18104101.

It is a cyclic number.

It is not a de Polignac number, because 20280263 - 2² = 20280259 is a prime.

It is a super-2 number, since 2×20280263² = 822578134698338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280763) 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, 16688 + ... + 17861.

It is an arithmetic number, because the mean of its divisors is an integer number (5078850).

Almost surely, 2^20280263 is an apocalyptic number.

20280263 is a deficient number, since it is larger than the sum of its proper divisors (35137).

20280263 is an equidigital number, since it uses as much as digits as its factorization.

20280263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35136.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20280263 is about 4503.3613001846. The cubic root of 20280263 is about 272.7038028726.

Adding to 20280263 its reverse (36208202), we get a palindrome (56488465).

The spelling of 20280263 in words is "twenty million, two hundred eighty thousand, two hundred sixty-three".