20415436 has 24 divisors (see below), whose sum is σ = 38401776. Its totient is φ = 9461760.

The previous prime is 20415431. The next prime is 20415457. The reversal of 20415436 is 63451402.

It is a self number, because there is not a number n which added to its sum of digits gives 20415436.

It is not an unprimeable number, because it can be changed into a prime (20415431) 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 7 ways as a sum of consecutive naturals, for example, 2316 + ... + 6796.

It is an arithmetic number, because the mean of its divisors is an integer number (1600074).

Almost surely, 2^20415436 is an apocalyptic number.

It is an amenable number.

20415436 is a deficient number, since it is larger than the sum of its proper divisors (17986340).

20415436 is a wasteful number, since it uses less digits than its factorization.

20415436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4569 (or 4567 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20415436 is about 4518.3443870515. The cubic root of 20415436 is about 273.3083412935.

Adding to 20415436 its reverse (63451402), we get a palindrome (83866838).

The spelling of 20415436 in words is "twenty million, four hundred fifteen thousand, four hundred thirty-six".