20218079 has 8 divisors (see below), whose sum is σ = 23335968. Its totient is φ = 17157600.

The previous prime is 20218067. The next prime is 20218091. The reversal of 20218079 is 97081202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20218067) and next prime (20218091).

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

It is a cyclic number.

It is not a de Polignac number, because 20218079 - 2⁴ = 20218063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13592 + ... + 15005.

It is an arithmetic number, because the mean of its divisors is an integer number (2916996).

Almost surely, 2^20218079 is an apocalyptic number.

20218079 is a deficient number, since it is larger than the sum of its proper divisors (3117889).

20218079 is a wasteful number, since it uses less digits than its factorization.

20218079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28705.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20218079 is about 4496.4518233825. The cubic root of 20218079 is about 272.4247930941.

It can be divided in two parts, 202 and 18079, that added together give a palindrome (18281).

The spelling of 20218079 in words is "twenty million, two hundred eighteen thousand, seventy-nine".