20017494 has 48 divisors (see below), whose sum is σ = 50219520. Its totient is φ = 5644080.

The previous prime is 20017477. The next prime is 20017499. The reversal of 20017494 is 49471002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20017499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8949 + ... + 10959.

It is an arithmetic number, because the mean of its divisors is an integer number (1046240).

Almost surely, 2^20017494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20017494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25109760).

20017494 is an abundant number, since it is smaller than the sum of its proper divisors (30202026).

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

20017494 is a wasteful number, since it uses less digits than its factorization.

20017494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105 (or 2102 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20017494 is about 4474.0914161425. The cubic root of 20017494 is about 271.5208819648.

Adding to 20017494 its reverse (49471002), we get a palindrome (69488496).

The spelling of 20017494 in words is "twenty million, seventeen thousand, four hundred ninety-four".