20307660 has 24 divisors (see below), whose sum is σ = 56861616. Its totient is φ = 5415360.

The previous prime is 20307649. The next prime is 20307667. The reversal of 20307660 is 6670302.

It is a self number, because there is not a number n which added to its sum of digits gives 20307660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20307667) 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, 169171 + ... + 169290.

It is an arithmetic number, because the mean of its divisors is an integer number (2369234).

Almost surely, 2^20307660 is an apocalyptic number.

20307660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20307660 is an abundant number, since it is smaller than the sum of its proper divisors (36553956).

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

20307660 is a wasteful number, since it uses less digits than its factorization.

20307660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338473 (or 338471 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 20307660 is about 4506.4021125505. The cubic root of 20307660 is about 272.8265478990.

Adding to 20307660 its reverse (6670302), we get a palindrome (26977962).

The spelling of 20307660 in words is "twenty million, three hundred seven thousand, six hundred sixty".