20361859 has 4 divisors (see below), whose sum is σ = 23270704. Its totient is φ = 17453016.

The previous prime is 20361851. The next prime is 20361889. The reversal of 20361859 is 95816302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95816302 = 2 ⋅47908151.

It is not a de Polignac number, because 20361859 - 2³ = 20361851 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1454412 + ... + 1454425.

It is an arithmetic number, because the mean of its divisors is an integer number (5817676).

Almost surely, 2^20361859 is an apocalyptic number.

20361859 is a deficient number, since it is larger than the sum of its proper divisors (2908845).

20361859 is an equidigital number, since it uses as much as digits as its factorization.

20361859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2908844.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20361859 is about 4512.4116611852. The cubic root of 20361859 is about 273.0690473733.

The spelling of 20361859 in words is "twenty million, three hundred sixty-one thousand, eight hundred fifty-nine".