20680620 has 48 divisors (see below), whose sum is σ = 58652160. Its totient is φ = 5443776.

The previous prime is 20680613. The next prime is 20680631. The reversal of 20680620 is 2608602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2559 + ... + 6921.

It is an arithmetic number, because the mean of its divisors is an integer number (1221920).

Almost surely, 2^20680620 is an apocalyptic number.

20680620 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 20680620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29326080).

20680620 is an abundant number, since it is smaller than the sum of its proper divisors (37971540).

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

20680620 is a wasteful number, since it uses less digits than its factorization.

20680620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4454 (or 4452 counting only the distinct ones).

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

The square root of 20680620 is about 4547.5949687720. The cubic root of 20680620 is about 274.4866234801.

The spelling of 20680620 in words is "twenty million, six hundred eighty thousand, six hundred twenty".