20433605 has 4 divisors (see below), whose sum is σ = 24520332. Its totient is φ = 16346880.

The previous prime is 20433571. The next prime is 20433617. The reversal of 20433605 is 50633402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50633402 = 2 ⋅25316701.

It can be written as a sum of positive squares in 2 ways, for example, as 9351364 + 11082241 = 3058^2 + 3329^2 .

It is not a de Polignac number, because 20433605 - 2⁸ = 20433349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043356 + ... + 2043365.

It is an arithmetic number, because the mean of its divisors is an integer number (6130083).

Almost surely, 2^20433605 is an apocalyptic number.

It is an amenable number.

20433605 is a deficient number, since it is larger than the sum of its proper divisors (4086727).

20433605 is an equidigital number, since it uses as much as digits as its factorization.

20433605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086726.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 20433605 is about 4520.3545214950. The cubic root of 20433605 is about 273.3893954343.

The spelling of 20433605 in words is "twenty million, four hundred thirty-three thousand, six hundred five".