20630279 has 4 divisors (see below), whose sum is σ = 20671320. Its totient is φ = 20589240.

The previous prime is 20630249. The next prime is 20630293. The reversal of 20630279 is 97203602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97203602 = 2 ⋅48601801.

It is a cyclic number.

It is not a de Polignac number, because 20630279 - 2⁸ = 20630023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630209) by changing a digit.

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, 19757 + ... + 20774.

It is an arithmetic number, because the mean of its divisors is an integer number (5167830).

Almost surely, 2^20630279 is an apocalyptic number.

20630279 is a deficient number, since it is larger than the sum of its proper divisors (41041).

20630279 is an equidigital number, since it uses as much as digits as its factorization.

20630279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41040.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 20630279 is about 4542.0566927329. The cubic root of 20630279 is about 274.2637230348.

The spelling of 20630279 in words is "twenty million, six hundred thirty thousand, two hundred seventy-nine".