20718122 has 16 divisors (see below), whose sum is σ = 32257440. Its totient is φ = 9968112.

The previous prime is 20718109. The next prime is 20718149. The reversal of 20718122 is 22181702.

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, 29993 + ... + 30675.

It is an arithmetic number, because the mean of its divisors is an integer number (2016090).

Almost surely, 2^20718122 is an apocalyptic number.

20718122 is a deficient number, since it is larger than the sum of its proper divisors (11539318).

20718122 is a wasteful number, since it uses less digits than its factorization.

20718122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20718122 is about 4551.7163795650. The cubic root of 20718122 is about 274.6524402593.

Adding to 20718122 its reverse (22181702), we get a palindrome (42899824).

The spelling of 20718122 in words is "twenty million, seven hundred eighteen thousand, one hundred twenty-two".