20051320 has 32 divisors (see below), whose sum is σ = 45457200. Its totient is φ = 7959808.

The previous prime is 20051309. The next prime is 20051329. The reversal of 20051320 is 2315002.

It is a self number, because there is not a number n which added to its sum of digits gives 20051320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20051329) 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, 3651 + ... + 7309.

Almost surely, 2^20051320 is an apocalyptic number.

20051320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20051320 is an abundant number, since it is smaller than the sum of its proper divisors (25405880).

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

20051320 is a wasteful number, since it uses less digits than its factorization.

20051320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3807 (or 3803 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20051320 is about 4477.8700293778. The cubic root of 20051320 is about 271.6737365434.

Adding to 20051320 its reverse (2315002), we get a palindrome (22366322).

The spelling of 20051320 in words is "twenty million, fifty-one thousand, three hundred twenty".