20857370 has 8 divisors (see below), whose sum is σ = 37543284. Its totient is φ = 8342944.

The previous prime is 20857357. The next prime is 20857373. The reversal of 20857370 is 7375802.

It can be written as a sum of positive squares in 2 ways, for example, as 20133169 + 724201 = 4487^2 + 851^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20857373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1042859 + ... + 1042878.

Almost surely, 2^20857370 is an apocalyptic number.

20857370 is a deficient number, since it is larger than the sum of its proper divisors (16685914).

20857370 is a wasteful number, since it uses less digits than its factorization.

20857370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085744.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 20857370 is about 4566.9869717353. The cubic root of 20857370 is about 275.2663865020.

The spelling of 20857370 in words is "twenty million, eight hundred fifty-seven thousand, three hundred seventy".