20429005 has 8 divisors (see below), whose sum is σ = 24825600. Its totient is φ = 16136016.

The previous prime is 20428987. The next prime is 20429011. The reversal of 20429005 is 50092402.

It is a happy number.

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 20429005 - 2¹⁵ = 20396237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25465 + ... + 26254.

It is an arithmetic number, because the mean of its divisors is an integer number (3103200).

Almost surely, 2^20429005 is an apocalyptic number.

It is an amenable number.

20429005 is a deficient number, since it is larger than the sum of its proper divisors (4396595).

20429005 is an equidigital number, since it uses as much as digits as its factorization.

20429005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51803.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20429005 is about 4519.8456832065. The cubic root of 20429005 is about 273.3688788131.

It can be divided in two parts, 20 and 429005, that added together give a square (429025 = 655²).

The spelling of 20429005 in words is "twenty million, four hundred twenty-nine thousand, five".