20196405 has 16 divisors (see below), whose sum is σ = 35904960. Its totient is φ = 10771344.

The previous prime is 20196389. The next prime is 20196409. The reversal of 20196405 is 50469102.

20196405 is a `hidden beast` number, since 2 + 0 + 19 + 640 + 5 = 666.

It is not a de Polignac number, because 20196405 - 2⁴ = 20196389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20196409) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 74667 + ... + 74936.

It is an arithmetic number, because the mean of its divisors is an integer number (2244060).

Almost surely, 2^20196405 is an apocalyptic number.

It is an amenable number.

20196405 is a deficient number, since it is larger than the sum of its proper divisors (15708555).

20196405 is a wasteful number, since it uses less digits than its factorization.

20196405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149617 (or 149611 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20196405 is about 4494.0410545521. The cubic root of 20196405 is about 272.3274108431.

The spelling of 20196405 in words is "twenty million, one hundred ninety-six thousand, four hundred five".