20028351 has 8 divisors (see below), whose sum is σ = 30519424. Its totient is φ = 11444760.

The previous prime is 20028347. The next prime is 20028389. The reversal of 20028351 is 15382002.

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

It is not a de Polignac number, because 20028351 - 2² = 20028347 is a prime.

It is a super-2 number, since 2×20028351² = 802269687558402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 953731 = 20028351 / (2 + 0 + 0 + 2 + 8 + 3 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20028301) 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, 476845 + ... + 476886.

It is an arithmetic number, because the mean of its divisors is an integer number (3814928).

Almost surely, 2^20028351 is an apocalyptic number.

20028351 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20028351 is a deficient number, since it is larger than the sum of its proper divisors (10491073).

20028351 is an equidigital number, since it uses as much as digits as its factorization.

20028351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953741.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20028351 is about 4475.3045706410. The cubic root of 20028351 is about 271.5699618582.

The spelling of 20028351 in words is "twenty million, twenty-eight thousand, three hundred fifty-one".