20229139 has 4 divisors (see below), whose sum is σ = 23119024. Its totient is φ = 17339256.

The previous prime is 20229119. The next prime is 20229161. The reversal of 20229139 is 93192202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93192202 = 2 ⋅46596101.

It is a cyclic number.

It is not a de Polignac number, because 20229139 - 2¹³ = 20220947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20229119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444932 + ... + 1444945.

It is an arithmetic number, because the mean of its divisors is an integer number (5779756).

Almost surely, 2^20229139 is an apocalyptic number.

20229139 is a deficient number, since it is larger than the sum of its proper divisors (2889885).

20229139 is an equidigital number, since it uses as much as digits as its factorization.

20229139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889884.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20229139 is about 4497.6815138469. The cubic root of 20229139 is about 272.4744593519.

The spelling of 20229139 in words is "twenty million, two hundred twenty-nine thousand, one hundred thirty-nine".