20620680 has 64 divisors (see below), whose sum is σ = 62216640. Its totient is φ = 5467392.

The previous prime is 20620679. The next prime is 20620687. The reversal of 20620680 is 8602602.

It is a Cunningham number, because it is equal to 4541²-1.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20620680.

It is not an unprimeable number, because it can be changed into a prime (20620687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26862 + ... + 27618.

It is an arithmetic number, because the mean of its divisors is an integer number (972135).

Almost surely, 2^20620680 is an apocalyptic number.

20620680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20620680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31108320).

20620680 is an abundant number, since it is smaller than the sum of its proper divisors (41595960).

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

20620680 is a wasteful number, since it uses less digits than its factorization.

20620680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20620680 is about 4540.9998898921. Note that the first 3 decimals coincide. The cubic root of 20620680 is about 274.2211793236.

The spelling of 20620680 in words is "twenty million, six hundred twenty thousand, six hundred eighty".