20417340 has 96 divisors (see below), whose sum is σ = 62282304. Its totient is φ = 4976640.

The previous prime is 20417339. The next prime is 20417359. The reversal of 20417340 is 4371402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37470 + ... + 38010.

It is an arithmetic number, because the mean of its divisors is an integer number (648774).

Almost surely, 2^20417340 is an apocalyptic number.

20417340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20417340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31141152).

20417340 is an abundant number, since it is smaller than the sum of its proper divisors (41864964).

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

20417340 is a wasteful number, since it uses less digits than its factorization.

20417340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20417340 is about 4518.5550787835. Note that the first 3 decimals coincide. The cubic root of 20417340 is about 273.3168375265.

Adding to 20417340 its reverse (4371402), we get a palindrome (24788742).

The spelling of 20417340 in words is "twenty million, four hundred seventeen thousand, three hundred forty".