20707761 has 8 divisors (see below), whose sum is σ = 28078560. Its totient is φ = 13571072.

The previous prime is 20707759. The next prime is 20707781. The reversal of 20707761 is 16770702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20707761 - 2¹ = 20707759 is a prime.

It is a super-2 number, since 2×20707761² = 857622731266242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20707781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58320 + ... + 58673.

It is an arithmetic number, because the mean of its divisors is an integer number (3509820).

Almost surely, 2^20707761 is an apocalyptic number.

It is an amenable number.

20707761 is a deficient number, since it is larger than the sum of its proper divisors (7370799).

20707761 is a wasteful number, since it uses less digits than its factorization.

20707761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117055.

The product of its (nonzero) digits is 4116, while the sum is 30.

The square root of 20707761 is about 4550.5780951435. The cubic root of 20707761 is about 274.6066486501.

The spelling of 20707761 in words is "twenty million, seven hundred seven thousand, seven hundred sixty-one".