20706680 has 64 divisors (see below), whose sum is σ = 50725440. Its totient is φ = 7575552.

The previous prime is 20706677. The next prime is 20706683. The reversal of 20706680 is 8660702.

It is an interprime number because it is at equal distance from previous prime (20706677) and next prime (20706683).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20706683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24749 + ... + 25571.

It is an arithmetic number, because the mean of its divisors is an integer number (792585).

Almost surely, 2^20706680 is an apocalyptic number.

20706680 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 20706680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25362720).

20706680 is an abundant number, since it is smaller than the sum of its proper divisors (30018760).

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

20706680 is a wasteful number, since it uses less digits than its factorization.

20706680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20706680 is about 4550.4593174755. The cubic root of 20706680 is about 274.6018701687.

The spelling of 20706680 in words is "twenty million, seven hundred six thousand, six hundred eighty".