20500429 has 4 divisors (see below), whose sum is σ = 21391776. Its totient is φ = 19609084.

The previous prime is 20500427. The next prime is 20500433. The reversal of 20500429 is 92400502.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 20500429 - 2¹ = 20500427 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500423) 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, 445639 + ... + 445684.

It is an arithmetic number, because the mean of its divisors is an integer number (5347944).

Almost surely, 2^20500429 is an apocalyptic number.

It is an amenable number.

20500429 is a deficient number, since it is larger than the sum of its proper divisors (891347).

20500429 is an equidigital number, since it uses as much as digits as its factorization.

20500429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891346.

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

The square root of 20500429 is about 4527.7399439455. The cubic root of 20500429 is about 273.6870928476.

The spelling of 20500429 in words is "twenty million, five hundred thousand, four hundred twenty-nine".