20478436 has 12 divisors (see below), whose sum is σ = 39095280. Its totient is φ = 9308360.

The previous prime is 20478431. The next prime is 20478439. The reversal of 20478436 is 63487402.

It is not an unprimeable number, because it can be changed into a prime (20478431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232666 + ... + 232753.

It is an arithmetic number, because the mean of its divisors is an integer number (3257940).

Almost surely, 2^20478436 is an apocalyptic number.

It is an amenable number.

20478436 is a deficient number, since it is larger than the sum of its proper divisors (18616844).

20478436 is a wasteful number, since it uses less digits than its factorization.

20478436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465434 (or 465432 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 20478436 is about 4525.3105970751. The cubic root of 20478436 is about 273.5891867014.

The spelling of 20478436 in words is "twenty million, four hundred seventy-eight thousand, four hundred thirty-six".