20316440 has 32 divisors (see below), whose sum is σ = 45852480. Its totient is φ = 8101632.

The previous prime is 20316433. The next prime is 20316451. The reversal of 20316440 is 4461302.

It is a happy number.

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

It is a congruent 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, 17972 + ... + 19068.

It is an arithmetic number, because the mean of its divisors is an integer number (1432890).

Almost surely, 2^20316440 is an apocalyptic number.

20316440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20316440 is an abundant number, since it is smaller than the sum of its proper divisors (25536040).

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

20316440 is a wasteful number, since it uses less digits than its factorization.

20316440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571 (or 1567 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20316440 is about 4507.3761768905. The cubic root of 20316440 is about 272.8658610113.

Adding to 20316440 its reverse (4461302), we get a palindrome (24777742).

The spelling of 20316440 in words is "twenty million, three hundred sixteen thousand, four hundred forty".