20342579 has 4 divisors (see below), whose sum is σ = 20600160. Its totient is φ = 20085000.

The previous prime is 20342573. The next prime is 20342611. The reversal of 20342579 is 97524302.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20342579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20342573) 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, 128672 + ... + 128829.

It is an arithmetic number, because the mean of its divisors is an integer number (5150040).

Almost surely, 2^20342579 is an apocalyptic number.

20342579 is a deficient number, since it is larger than the sum of its proper divisors (257581).

20342579 is an equidigital number, since it uses as much as digits as its factorization.

20342579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257580.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20342579 is about 4510.2748253294. The cubic root of 20342579 is about 272.9828333430.

The spelling of 20342579 in words is "twenty million, three hundred forty-two thousand, five hundred seventy-nine".