20815162 has 4 divisors (see below), whose sum is σ = 31222746. Its totient is φ = 10407580.

The previous prime is 20815159. The next prime is 20815169. The reversal of 20815162 is 26151802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26151802 = 2 ⋅13075901.

It can be written as a sum of positive squares in only one way, i.e., 20620681 + 194481 = 4541^2 + 441^2 .

It is not an unprimeable number, because it can be changed into a prime (20815169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5203789 + ... + 5203792.

Almost surely, 2^20815162 is an apocalyptic number.

20815162 is a deficient number, since it is larger than the sum of its proper divisors (10407584).

20815162 is a wasteful number, since it uses less digits than its factorization.

20815162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10407583.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 20815162 is about 4562.3636417980. The cubic root of 20815162 is about 275.0805802429.

Adding to 20815162 its reverse (26151802), we get a palindrome (46966964).

The spelling of 20815162 in words is "twenty million, eight hundred fifteen thousand, one hundred sixty-two".