20539430 has 8 divisors (see below), whose sum is σ = 36970992. Its totient is φ = 8215768.

The previous prime is 20539427. The next prime is 20539433. The reversal of 20539430 is 3493502.

It is an interprime number because it is at equal distance from previous prime (20539427) and next prime (20539433).

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20539430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20539433) 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, 1026962 + ... + 1026981.

It is an arithmetic number, because the mean of its divisors is an integer number (4621374).

Almost surely, 2^20539430 is an apocalyptic number.

20539430 is a deficient number, since it is larger than the sum of its proper divisors (16431562).

20539430 is a wasteful number, since it uses less digits than its factorization.

20539430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053950.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20539430 is about 4532.0447923647. The cubic root of 20539430 is about 273.8605413886.

The spelling of 20539430 in words is "twenty million, five hundred thirty-nine thousand, four hundred thirty".