20001562 has 16 divisors (see below), whose sum is σ = 34759872. Its totient is φ = 8454240.

The previous prime is 20001557. The next prime is 20001613. The reversal of 20001562 is 26510002.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8764 + ... + 10807.

It is an arithmetic number, because the mean of its divisors is an integer number (2172492).

Almost surely, 2^20001562 is an apocalyptic number.

20001562 is a deficient number, since it is larger than the sum of its proper divisors (14758310).

20001562 is a wasteful number, since it uses less digits than its factorization.

20001562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19653.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20001562 is about 4472.3105884990. The cubic root of 20001562 is about 271.4488280094.

Adding to 20001562 its reverse (26510002), we get a palindrome (46511564).

The spelling of 20001562 in words is "twenty million, one thousand, five hundred sixty-two".