20242279 has 4 divisors (see below), whose sum is σ = 20259184. Its totient is φ = 20225376.

The previous prime is 20242273. The next prime is 20242297. The reversal of 20242279 is 97224202.

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

It is a cyclic number.

It is not a de Polignac number, because 20242279 - 2⁵ = 20242247 is a prime.

It is a super-2 number, since 2×20242279² = 819499718227682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20242273) 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, 6507 + ... + 9100.

It is an arithmetic number, because the mean of its divisors is an integer number (5064796).

Almost surely, 2^20242279 is an apocalyptic number.

20242279 is a deficient number, since it is larger than the sum of its proper divisors (16905).

20242279 is a wasteful number, since it uses less digits than its factorization.

20242279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16904.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20242279 is about 4499.1420293207. The cubic root of 20242279 is about 272.5334425752.

The spelling of 20242279 in words is "twenty million, two hundred forty-two thousand, two hundred seventy-nine".