20229439 has 4 divisors (see below), whose sum is σ = 21419424. Its totient is φ = 19039456.

The previous prime is 20229431. The next prime is 20229463. The reversal of 20229439 is 93492202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20229439 - 2³ = 20229431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20229439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20229431) 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, 594967 + ... + 595000.

It is an arithmetic number, because the mean of its divisors is an integer number (5354856).

Almost surely, 2^20229439 is an apocalyptic number.

20229439 is a deficient number, since it is larger than the sum of its proper divisors (1189985).

20229439 is a wasteful number, since it uses less digits than its factorization.

20229439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189984.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20229439 is about 4497.7148642394. The cubic root of 20229439 is about 272.4758062857.

The spelling of 20229439 in words is "twenty million, two hundred twenty-nine thousand, four hundred thirty-nine".