20780162 has 16 divisors (see below), whose sum is σ = 34476792. Its totient is φ = 9331200.

The previous prime is 20780143. The next prime is 20780173. The reversal of 20780162 is 26108702.

It can be written as a sum of positive squares in 4 ways, for example, as 20421361 + 358801 = 4519^2 + 599^2 .

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 9839 + ... + 11762.

Almost surely, 2^20780162 is an apocalyptic number.

20780162 is a deficient number, since it is larger than the sum of its proper divisors (13696630).

20780162 is a wasteful number, since it uses less digits than its factorization.

20780162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21653.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20780162 is about 4558.5262969517. The cubic root of 20780162 is about 274.9263141420.

Adding to 20780162 its reverse (26108702), we get a palindrome (46888864).

The spelling of 20780162 in words is "twenty million, seven hundred eighty thousand, one hundred sixty-two".