20353579 has 4 divisors (see below), whose sum is σ = 21424840. Its totient is φ = 19282320.

The previous prime is 20353559. The next prime is 20353583. The reversal of 20353579 is 97535302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97535302 = 2 ⋅48767651.

It is a cyclic number.

It is not a de Polignac number, because 20353579 - 2¹⁹ = 19829291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20353519) 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, 535602 + ... + 535639.

It is an arithmetic number, because the mean of its divisors is an integer number (5356210).

Almost surely, 2^20353579 is an apocalyptic number.

20353579 is a deficient number, since it is larger than the sum of its proper divisors (1071261).

20353579 is a wasteful number, since it uses less digits than its factorization.

20353579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071260.

The product of its (nonzero) digits is 28350, while the sum is 34.

The square root of 20353579 is about 4511.4940984113. The cubic root of 20353579 is about 273.0320285160.

The spelling of 20353579 in words is "twenty million, three hundred fifty-three thousand, five hundred seventy-nine".