20980751 has 8 divisors (see below), whose sum is σ = 22990800. Its totient is φ = 18987840.

The previous prime is 20980747. The next prime is 20980759. The reversal of 20980751 is 15708902.

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 20980751 - 2² = 20980747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20980759) 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, 1646 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (2873850).

Almost surely, 2^20980751 is an apocalyptic number.

20980751 is a deficient number, since it is larger than the sum of its proper divisors (2010049).

20980751 is a wasteful number, since it uses less digits than its factorization.

20980751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8569.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20980751 is about 4580.4749753710. The cubic root of 20980751 is about 275.8080957875.

The spelling of 20980751 in words is "twenty million, nine hundred eighty thousand, seven hundred fifty-one".