20876257 has 8 divisors (see below), whose sum is σ = 21450240. Its totient is φ = 20305440.

The previous prime is 20876239. The next prime is 20876263. The reversal of 20876257 is 75267802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20876257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20876227) 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, 19108 + ... + 20170.

It is an arithmetic number, because the mean of its divisors is an integer number (2681280).

Almost surely, 2^20876257 is an apocalyptic number.

It is an amenable number.

20876257 is a deficient number, since it is larger than the sum of its proper divisors (573983).

20876257 is a wasteful number, since it uses less digits than its factorization.

20876257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 20876257 is about 4569.0542785132. The cubic root of 20876257 is about 275.3494488721.

The spelling of 20876257 in words is "twenty million, eight hundred seventy-six thousand, two hundred fifty-seven".