20763005 has 4 divisors (see below), whose sum is σ = 24915612. Its totient is φ = 16610400.

The previous prime is 20762999. The next prime is 20763007. The reversal of 20763005 is 50036702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2393209 + 18369796 = 1547^2 + 4286^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20763005 is a prime.

It is a super-2 number, since 2×20763005² = 862204753260050, 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 (20763007) 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, 2076296 + ... + 2076305.

It is an arithmetic number, because the mean of its divisors is an integer number (6228903).

Almost surely, 2^20763005 is an apocalyptic number.

It is an amenable number.

20763005 is a deficient number, since it is larger than the sum of its proper divisors (4152607).

20763005 is an equidigital number, since it uses as much as digits as its factorization.

20763005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4152606.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20763005 is about 4556.6440501755. The cubic root of 20763005 is about 274.8506296257.

Adding to 20763005 its reverse (50036702), we get a palindrome (70799707).

The spelling of 20763005 in words is "twenty million, seven hundred sixty-three thousand, five".