20980257 has 8 divisors (see below), whose sum is σ = 28075776. Its totient is φ = 13935792.

The previous prime is 20980247. The next prime is 20980277. The reversal of 20980257 is 75208902.

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

It is not a de Polignac number, because 20980257 - 2⁴ = 20980241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20980247) 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, 11793 + ... + 13454.

It is an arithmetic number, because the mean of its divisors is an integer number (3509472).

Almost surely, 2^20980257 is an apocalyptic number.

It is an amenable number.

20980257 is a deficient number, since it is larger than the sum of its proper divisors (7095519).

20980257 is a wasteful number, since it uses less digits than its factorization.

20980257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25527.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 20980257 is about 4580.4210505149. The cubic root of 20980257 is about 275.8059311006.

The spelling of 20980257 in words is "twenty million, nine hundred eighty thousand, two hundred fifty-seven".