20364405 has 16 divisors (see below), whose sum is σ = 32786880. Its totient is φ = 10793088.

The previous prime is 20364403. The next prime is 20364431. The reversal of 20364405 is 50446302.

It is not a de Polignac number, because 20364405 - 2¹ = 20364403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20364401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1720 + ... + 6609.

It is an arithmetic number, because the mean of its divisors is an integer number (2049180).

Almost surely, 2^20364405 is an apocalyptic number.

It is an amenable number.

20364405 is a deficient number, since it is larger than the sum of its proper divisors (12422475).

20364405 is a wasteful number, since it uses less digits than its factorization.

20364405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8500.

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

The square root of 20364405 is about 4512.6937631530. The cubic root of 20364405 is about 273.0804282074.

It can be divided in two parts, 2036 and 4405, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 20364405 in words is "twenty million, three hundred sixty-four thousand, four hundred five".