20715761 has 8 divisors (see below), whose sum is σ = 22663200. Its totient is φ = 18779040.

The previous prime is 20715731. The next prime is 20715763. The reversal of 20715761 is 16751702.

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 20715761 - 2⁶ = 20715697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20715763) 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, 1685 + ... + 6653.

It is an arithmetic number, because the mean of its divisors is an integer number (2832900).

Almost surely, 2^20715761 is an apocalyptic number.

It is an amenable number.

20715761 is a deficient number, since it is larger than the sum of its proper divisors (1947439).

20715761 is a wasteful number, since it uses less digits than its factorization.

20715761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5359.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 20715761 is about 4551.4570194609. The cubic root of 20715761 is about 274.6420068965.

The spelling of 20715761 in words is "twenty million, seven hundred fifteen thousand, seven hundred sixty-one".