20628249 has 8 divisors (see below), whose sum is σ = 27606912. Its totient is φ = 13700880.

The previous prime is 20628247. The next prime is 20628271. The reversal of 20628249 is 94282602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20628249 - 2¹ = 20628247 is a prime.

It is a super-3 number, since 3×20628249³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20628247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11874 + ... + 13499.

It is an arithmetic number, because the mean of its divisors is an integer number (3450864).

Almost surely, 2^20628249 is an apocalyptic number.

It is an amenable number.

20628249 is a deficient number, since it is larger than the sum of its proper divisors (6978663).

20628249 is a wasteful number, since it uses less digits than its factorization.

20628249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25647.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20628249 is about 4541.8332201876. The cubic root of 20628249 is about 274.2547269759.

The spelling of 20628249 in words is "twenty million, six hundred twenty-eight thousand, two hundred forty-nine".