20315436 has 24 divisors (see below), whose sum is σ = 48506304. Its totient is φ = 6614160.

The previous prime is 20315429. The next prime is 20315441. The reversal of 20315436 is 63451302.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19170 + ... + 20201.

It is an arithmetic number, because the mean of its divisors is an integer number (2021096).

Almost surely, 2^20315436 is an apocalyptic number.

It is an amenable number.

20315436 is an abundant number, since it is smaller than the sum of its proper divisors (28190868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20315436 is a wasteful number, since it uses less digits than its factorization.

20315436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39421 (or 39419 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20315436 is about 4507.2648025160. The cubic root of 20315436 is about 272.8613660991.

Adding to 20315436 its reverse (63451302), we get a palindrome (83766738).

The spelling of 20315436 in words is "twenty million, three hundred fifteen thousand, four hundred thirty-six".