20707660 has 12 divisors (see below), whose sum is σ = 43486128. Its totient is φ = 8283056.

The previous prime is 20707651. The next prime is 20707669. The reversal of 20707660 is 6670702.

It is an interprime number because it is at equal distance from previous prime (20707651) and next prime (20707669).

It is not an unprimeable number, because it can be changed into a prime (20707669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517672 + ... + 517711.

It is an arithmetic number, because the mean of its divisors is an integer number (3623844).

Almost surely, 2^20707660 is an apocalyptic number.

20707660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20707660 is an abundant number, since it is smaller than the sum of its proper divisors (22778468).

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

20707660 is a wasteful number, since it uses less digits than its factorization.

20707660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035392 (or 1035390 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 20707660 is about 4550.5669976389. The cubic root of 20707660 is about 274.6062021941.

It can be divided in two parts, 2070 and 7660, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 20707660 in words is "twenty million, seven hundred seven thousand, six hundred sixty".