20857108 has 6 divisors (see below), whose sum is σ = 36499946. Its totient is φ = 10428552.

The previous prime is 20857103. The next prime is 20857157. The reversal of 20857108 is 80175802.

It can be written as a sum of positive squares in only one way, i.e., 19607184 + 1249924 = 4428^2 + 1118^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20857108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2607135 + ... + 2607142.

Almost surely, 2^20857108 is an apocalyptic number.

It is an amenable number.

20857108 is a deficient number, since it is larger than the sum of its proper divisors (15642838).

20857108 is a wasteful number, since it uses less digits than its factorization.

20857108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5214281 (or 5214279 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 20857108 is about 4566.9582875257. The cubic root of 20857108 is about 275.2652339103.

The spelling of 20857108 in words is "twenty million, eight hundred fifty-seven thousand, one hundred eight".