20474405 has 24 divisors (see below), whose sum is σ = 28795032. Its totient is φ = 13934592.

The previous prime is 20474371. The next prime is 20474411. The reversal of 20474405 is 50447402.

It can be written as a sum of positive squares in 4 ways, for example, as 25921 + 20448484 = 161^2 + 4522^2 .

It is not a de Polignac number, because 20474405 - 2¹⁸ = 20212261 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47069 + ... + 47501.

It is an arithmetic number, because the mean of its divisors is an integer number (1199793).

Almost surely, 2^20474405 is an apocalyptic number.

It is an amenable number.

20474405 is a deficient number, since it is larger than the sum of its proper divisors (8320627).

20474405 is a wasteful number, since it uses less digits than its factorization.

20474405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 20474405 is about 4524.8651913621. The cubic root of 20474405 is about 273.5712343152.

The spelling of 20474405 in words is "twenty million, four hundred seventy-four thousand, four hundred five".