20434605 has 32 divisors (see below), whose sum is σ = 33868800. Its totient is φ = 10513920.

The previous prime is 20434597. The next prime is 20434607. The reversal of 20434605 is 50643402.

It is not a de Polignac number, because 20434605 - 2³ = 20434597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91524 + ... + 91746.

It is an arithmetic number, because the mean of its divisors is an integer number (1058400).

Almost surely, 2^20434605 is an apocalyptic number.

It is an amenable number.

20434605 is a deficient number, since it is larger than the sum of its proper divisors (13434195).

20434605 is a wasteful number, since it uses less digits than its factorization.

20434605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20434605 is about 4520.4651309351. The cubic root of 20434605 is about 273.3938551619.

The spelling of 20434605 in words is "twenty million, four hundred thirty-four thousand, six hundred five".