20279109 has 4 divisors (see below), whose sum is σ = 27038816. Its totient is φ = 13519404.

The previous prime is 20279081. The next prime is 20279117. The reversal of 20279109 is 90197202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20279109 - 2¹⁵ = 20246341 is a prime.

It is a super-2 number, since 2×20279109² = 822484523667762, 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 (20279159) 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, 3379849 + ... + 3379854.

It is an arithmetic number, because the mean of its divisors is an integer number (6759704).

Almost surely, 2^20279109 is an apocalyptic number.

It is an amenable number.

20279109 is a deficient number, since it is larger than the sum of its proper divisors (6759707).

20279109 is an equidigital number, since it uses as much as digits as its factorization.

20279109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6759706.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 20279109 is about 4503.2331718444. The cubic root of 20279109 is about 272.6986302546.

The spelling of 20279109 in words is "twenty million, two hundred seventy-nine thousand, one hundred nine".