20429499 has 4 divisors (see below), whose sum is σ = 27239336. Its totient is φ = 13619664.

The previous prime is 20429489. The next prime is 20429531. The reversal of 20429499 is 99492402.

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

It is not a de Polignac number, because 20429499 - 2⁹ = 20428987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20429489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3404914 + ... + 3404919.

It is an arithmetic number, because the mean of its divisors is an integer number (6809834).

Almost surely, 2^20429499 is an apocalyptic number.

20429499 is a deficient number, since it is larger than the sum of its proper divisors (6809837).

20429499 is an equidigital number, since it uses as much as digits as its factorization.

20429499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6809836.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 20429499 is about 4519.9003307595. The cubic root of 20429499 is about 273.3710822674.

The spelling of 20429499 in words is "twenty million, four hundred twenty-nine thousand, four hundred ninety-nine".