20317040 has 40 divisors (see below), whose sum is σ = 50019120. Its totient is φ = 7648256.

The previous prime is 20317021. The next prime is 20317043. The reversal of 20317040 is 4071302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×20317040² = 825564228723200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317043) 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, 6110 + ... + 8829.

It is an arithmetic number, because the mean of its divisors is an integer number (1250478).

Almost surely, 2^20317040 is an apocalyptic number.

20317040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20317040 is an abundant number, since it is smaller than the sum of its proper divisors (29702080).

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

20317040 is a wasteful number, since it uses less digits than its factorization.

20317040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14969 (or 14963 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 20317040 is about 4507.4427339679. The cubic root of 20317040 is about 272.8685471430.

Adding to 20317040 its reverse (4071302), we get a palindrome (24388342).

The spelling of 20317040 in words is "twenty million, three hundred seventeen thousand, forty".