20707760 has 20 divisors (see below), whose sum is σ = 48145728. Its totient is φ = 8283072.

The previous prime is 20707759. The next prime is 20707781. The reversal of 20707760 is 6770702.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×20707760² = 857622648435200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129344 + ... + 129503.

Almost surely, 2^20707760 is an apocalyptic number.

20707760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20707760 is an abundant number, since it is smaller than the sum of its proper divisors (27437968).

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

20707760 is a wasteful number, since it uses less digits than its factorization.

20707760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258860 (or 258854 counting only the distinct ones).

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 20707760 is about 4550.5779852674. The cubic root of 20707760 is about 274.6066442298.

The spelling of 20707760 in words is "twenty million, seven hundred seven thousand, seven hundred sixty".