20679620 has 24 divisors (see below), whose sum is σ = 46768344. Its totient is φ = 7635456.

The previous prime is 20679613. The next prime is 20679641. The reversal of 20679620 is 2697602.

It can be written as a sum of positive squares in 4 ways, for example, as 3655744 + 17023876 = 1912^2 + 4126^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39509 + ... + 40028.

It is an arithmetic number, because the mean of its divisors is an integer number (1948681).

Almost surely, 2^20679620 is an apocalyptic number.

20679620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20679620 is an abundant number, since it is smaller than the sum of its proper divisors (26088724).

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

20679620 is a wasteful number, since it uses less digits than its factorization.

20679620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79559 (or 79557 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20679620 is about 4547.4850192167. The cubic root of 20679620 is about 274.4821991923.

The spelling of 20679620 in words is "twenty million, six hundred seventy-nine thousand, six hundred twenty".