20017072 has 20 divisors (see below), whose sum is σ = 40035136. Its totient is φ = 9685440.

The previous prime is 20017043. The next prime is 20017091. The reversal of 20017072 is 27071002.

20017072 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19683 + ... + 20674.

Almost surely, 2^20017072 is an apocalyptic number.

It is an amenable number.

20017072 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20017072 is a wasteful number, since it uses less digits than its factorization.

20017072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40396 (or 40390 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 20017072 is about 4474.0442554807. The cubic root of 20017072 is about 271.5189739234.

Adding to 20017072 its reverse (27071002), we get a palindrome (47088074).

The spelling of 20017072 in words is "twenty million, seventeen thousand, seventy-two".