20361857 has 8 divisors (see below), whose sum is σ = 21513600. Its totient is φ = 19240144.

The previous prime is 20361851. The next prime is 20361889. The reversal of 20361857 is 75816302.

It is a happy number.

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 20361857 - 2¹⁰ = 20360833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20361851) 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 7 ways as a sum of consecutive naturals, for example, 6107 + ... + 8832.

It is an arithmetic number, because the mean of its divisors is an integer number (2689200).

Almost surely, 2^20361857 is an apocalyptic number.

It is an amenable number.

20361857 is a deficient number, since it is larger than the sum of its proper divisors (1151743).

20361857 is a wasteful number, since it uses less digits than its factorization.

20361857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15015.

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

The square root of 20361857 is about 4512.4114395742. The cubic root of 20361857 is about 273.0690384328.

The spelling of 20361857 in words is "twenty million, three hundred sixty-one thousand, eight hundred fifty-seven".