20370857 has 8 divisors (see below), whose sum is σ = 22020936. Its totient is φ = 18732672.

The previous prime is 20370853. The next prime is 20370859. The reversal of 20370857 is 75807302.

It can be written as a sum of positive squares in 4 ways, for example, as 913936 + 19456921 = 956^2 + 4411^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20370857 - 2² = 20370853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20370851) 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, 773 + ... + 6429.

It is an arithmetic number, because the mean of its divisors is an integer number (2752617).

Almost surely, 2^20370857 is an apocalyptic number.

It is an amenable number.

20370857 is a deficient number, since it is larger than the sum of its proper divisors (1650079).

20370857 is a wasteful number, since it uses less digits than its factorization.

20370857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5947.

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

The square root of 20370857 is about 4513.4085788902. The cubic root of 20370857 is about 273.1092649429.

The spelling of 20370857 in words is "twenty million, three hundred seventy thousand, eight hundred fifty-seven".