20205861 has 8 divisors (see below), whose sum is σ = 29013600. Its totient is φ = 12434352.

The previous prime is 20205859. The next prime is 20205883. The reversal of 20205861 is 16850202.

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

It is not a de Polignac number, because 20205861 - 2¹ = 20205859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205821) 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, 259011 + ... + 259088.

It is an arithmetic number, because the mean of its divisors is an integer number (3626700).

Almost surely, 2^20205861 is an apocalyptic number.

It is an amenable number.

20205861 is a deficient number, since it is larger than the sum of its proper divisors (8807739).

20205861 is a wasteful number, since it uses less digits than its factorization.

20205861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518115.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 20205861 is about 4495.0929912517. The cubic root of 20205861 is about 272.3699056371.

The spelling of 20205861 in words is "twenty million, two hundred five thousand, eight hundred sixty-one".