20579942 has 4 divisors (see below), whose sum is σ = 30869916. Its totient is φ = 10289970.

The previous prime is 20579927. The next prime is 20579947. The reversal of 20579942 is 24997502.

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

It is a junction number, because it is equal to n+sod(n) for n = 20579896 and 20579905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20579947) 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 as a sum of consecutive naturals, namely, 5144984 + ... + 5144987.

It is an arithmetic number, because the mean of its divisors is an integer number (7717479).

Almost surely, 2^20579942 is an apocalyptic number.

20579942 is a deficient number, since it is larger than the sum of its proper divisors (10289974).

20579942 is a wasteful number, since it uses less digits than its factorization.

20579942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10289973.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 20579942 is about 4536.5120963136. The cubic root of 20579942 is about 274.0404774413.

The spelling of 20579942 in words is "twenty million, five hundred seventy-nine thousand, nine hundred forty-two".