20017290 has 16 divisors (see below), whose sum is σ = 48041568. Its totient is φ = 5337936.

The previous prime is 20017247. The next prime is 20017301. The reversal of 20017290 is 9271002.

It is a happy number.

It is a Curzon number.

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, 333592 + ... + 333651.

It is an arithmetic number, because the mean of its divisors is an integer number (3002598).

Almost surely, 2^20017290 is an apocalyptic number.

20017290 is an abundant number, since it is smaller than the sum of its proper divisors (28024278).

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

20017290 is a wasteful number, since it uses less digits than its factorization.

20017290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667253.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 20017290 is about 4474.0686181595. The cubic root of 20017290 is about 271.5199595974.

Adding to 20017290 its reverse (9271002), we get a palindrome (29288292).

The spelling of 20017290 in words is "twenty million, seventeen thousand, two hundred ninety".