20628299 has 4 divisors (see below), whose sum is σ = 21293760. Its totient is φ = 19962840.

The previous prime is 20628287. The next prime is 20628313. The reversal of 20628299 is 99282602.

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

It is a cyclic number.

It is not a de Polignac number, because 20628299 - 2²⁴ = 3851083 is a prime.

It is a super-3 number, since 3×20628299³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20628199) 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, 332684 + ... + 332745.

It is an arithmetic number, because the mean of its divisors is an integer number (5323440).

Almost surely, 2^20628299 is an apocalyptic number.

20628299 is a deficient number, since it is larger than the sum of its proper divisors (665461).

20628299 is an equidigital number, since it uses as much as digits as its factorization.

20628299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665460.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 20628299 is about 4541.8387245696. The cubic root of 20628299 is about 274.2549485608.

The spelling of 20628299 in words is "twenty million, six hundred twenty-eight thousand, two hundred ninety-nine".