20398234 has 8 divisors (see below), whose sum is σ = 30618900. Its totient is φ = 10191936.

The previous prime is 20398219. The next prime is 20398237. The reversal of 20398234 is 43289302.

It can be written as a sum of positive squares in 2 ways, for example, as 16378209 + 4020025 = 4047^2 + 2005^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20398196 and 20398205.

It is not an unprimeable number, because it can be changed into a prime (20398237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1282 + ... + 6514.

Almost surely, 2^20398234 is an apocalyptic number.

20398234 is a deficient number, since it is larger than the sum of its proper divisors (10220666).

20398234 is a wasteful number, since it uses less digits than its factorization.

20398234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7184.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 20398234 is about 4516.4404125373. The cubic root of 20398234 is about 273.2315567274.

The spelling of 20398234 in words is "twenty million, three hundred ninety-eight thousand, two hundred thirty-four".