20857316 has 6 divisors (see below), whose sum is σ = 36500310. Its totient is φ = 10428656.

The previous prime is 20857313. The next prime is 20857321. The reversal of 20857316 is 61375802.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11222500 + 9634816 = 3350^2 + 3104^2 .

It is not an unprimeable number, because it can be changed into a prime (20857313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2607161 + ... + 2607168.

It is an arithmetic number, because the mean of its divisors is an integer number (6083385).

Almost surely, 2^20857316 is an apocalyptic number.

It is an amenable number.

20857316 is a deficient number, since it is larger than the sum of its proper divisors (15642994).

20857316 is a wasteful number, since it uses less digits than its factorization.

20857316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5214333 (or 5214331 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20857316 is about 4566.9810597374. The cubic root of 20857316 is about 275.2661489457.

The spelling of 20857316 in words is "twenty million, eight hundred fifty-seven thousand, three hundred sixteen".