20389330 has 16 divisors (see below), whose sum is σ = 39524184. Its totient is φ = 7528320.

The previous prime is 20389319. The next prime is 20389357. The reversal of 20389330 is 3398302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18844281 + 1545049 = 4341^2 + 1243^2 .

It is a super-4 number, since 4×20389330⁴ (a number of 30 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78291 + ... + 78550.

Almost surely, 2^20389330 is an apocalyptic number.

20389330 is a deficient number, since it is larger than the sum of its proper divisors (19134854).

20389330 is a wasteful number, since it uses less digits than its factorization.

20389330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156861.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20389330 is about 4515.4545729085. The cubic root of 20389330 is about 273.1917949871.

The spelling of 20389330 in words is "twenty million, three hundred eighty-nine thousand, three hundred thirty".