20628283 has 4 divisors (see below), whose sum is σ = 22215088. Its totient is φ = 19041480.

The previous prime is 20628271. The next prime is 20628287. The reversal of 20628283 is 38282602.

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 20628283 - 2⁹ = 20627771 is a prime.

It is a super-3 number, since 3×20628283³ (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 (20628287) 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, 793383 + ... + 793408.

It is an arithmetic number, because the mean of its divisors is an integer number (5553772).

Almost surely, 2^20628283 is an apocalyptic number.

20628283 is a deficient number, since it is larger than the sum of its proper divisors (1586805).

20628283 is a wasteful number, since it uses less digits than its factorization.

20628283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586804.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20628283 is about 4541.8369631681. The cubic root of 20628283 is about 274.2548776536.

The spelling of 20628283 in words is "twenty million, six hundred twenty-eight thousand, two hundred eighty-three".