20972018 has 8 divisors (see below), whose sum is σ = 31706112. Its totient is φ = 10403316.

The previous prime is 20971997. The next prime is 20972023. The reversal of 20972018 is 81027902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41030 + ... + 41537.

It is an arithmetic number, because the mean of its divisors is an integer number (3963264).

Almost surely, 2^20972018 is an apocalyptic number.

20972018 is a deficient number, since it is larger than the sum of its proper divisors (10734094).

20972018 is a wasteful number, since it uses less digits than its factorization.

20972018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82696.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20972018 is about 4579.5215907341. The cubic root of 20972018 is about 275.7698231447.

It can be divided in two parts, 209 and 72018, that added together give a palindrome (72227).

The spelling of 20972018 in words is "twenty million, nine hundred seventy-two thousand, eighteen".