20317340 has 24 divisors (see below), whose sum is σ = 42783552. Its totient is φ = 8104640.

The previous prime is 20317337. The next prime is 20317343. The reversal of 20317340 is 4371302.

It is an interprime number because it is at equal distance from previous prime (20317337) and next prime (20317343).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7442 + ... + 9798.

It is an arithmetic number, because the mean of its divisors is an integer number (1782648).

Almost surely, 2^20317340 is an apocalyptic number.

20317340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20317340 is an abundant number, since it is smaller than the sum of its proper divisors (22466212).

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

20317340 is a wasteful number, since it uses less digits than its factorization.

20317340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797 (or 2795 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20317340 is about 4507.4760121381. The cubic root of 20317340 is about 272.8698901891.

Adding to 20317340 its reverse (4371302), we get a palindrome (24688642).

The spelling of 20317340 in words is "twenty million, three hundred seventeen thousand, three hundred forty".