20418572 has 12 divisors (see below), whose sum is σ = 37286256. Its totient is φ = 9765360.

The previous prime is 20418571. The next prime is 20418583. The reversal of 20418572 is 27581402.

It is not an unprimeable number, because it can be changed into a prime (20418571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110879 + ... + 111062.

It is an arithmetic number, because the mean of its divisors is an integer number (3107188).

Almost surely, 2^20418572 is an apocalyptic number.

It is an amenable number.

20418572 is a deficient number, since it is larger than the sum of its proper divisors (16867684).

20418572 is a wasteful number, since it uses less digits than its factorization.

20418572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221968 (or 221966 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20418572 is about 4518.6914034928. The cubic root of 20418572 is about 273.3223348076.

Adding to 20418572 its reverse (27581402), we get a palindrome (47999974).

The spelling of 20418572 in words is "twenty million, four hundred eighteen thousand, five hundred seventy-two".