20028349 has 4 divisors (see below), whose sum is σ = 21849120. Its totient is φ = 18207580.

The previous prime is 20028347. The next prime is 20028389. The reversal of 20028349 is 94382002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20028349 - 2¹ = 20028347 is a prime.

It is a super-2 number, since 2×20028349² = 802269527331602, 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 (20028341) 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, 910369 + ... + 910390.

It is an arithmetic number, because the mean of its divisors is an integer number (5462280).

Almost surely, 2^20028349 is an apocalyptic number.

It is an amenable number.

20028349 is a deficient number, since it is larger than the sum of its proper divisors (1820771).

20028349 is a wasteful number, since it uses less digits than its factorization.

20028349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820770.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20028349 is about 4475.3043471925. The cubic root of 20028349 is about 271.5699528187.

The spelling of 20028349 in words is "twenty million, twenty-eight thousand, three hundred forty-nine".